GORUCK x Carryology GRXC2 | The Samurai Rises

Over two years of design and development. The second installment of the GORUCK x Carryology GRXC project has arrived. A legendary Hall of Fame icon inspired by the samurai warriors of Japan’s past. 

Introducing the GORUCK x Carryology GRXC2 Samurai GR1.


Before we slice into the details, let’s explain the GRXC project for more clarity. The letters ‘GRXC’ stand for GORUCK X Carryology, of course. 

What is the criteria of a GRXC project and what makes it unique? Three major elements:

1. It will always be based upon the GR1 backpack platform: a Carry Awards Hall of Fame winner, an icon of carry, and Carryology team and community favorite. 

2. The project codename will always be based upon either a fictional warrior or warrior from history, which will then influence the design of the end product.

3. It will follow the sequential naming system of GRXC#. The first was the GRXC1 Guerrilla X. Now the GRXC2 Samurai. 


Why samurai? There are nearly infinite warriors to choose from when we’re referencing the pages of history and the endless folds of the human imagination (folklore, mythology, movies, comics, novels, cartoons, etc.). Selecting a suitable inspiration isn’t a science, but we did consider the previous GRXC1’s character in the process. “Guerrilla X”, our fictional soldier from the future was brought to life via Dan Matsuda’s illustration. The sci-fi future backstory of the character led to the selection of high-tech materials and manufacturing processes like Dyneema, titanium, and laser engraving. 

For GRXC2, we aimed in the polar opposite direction: a well-known, nonfictional, warrior from history. As a child growing up, I loved watching action movies from decades before I was born. While I had many different favorites, I was always fascinated by old black-and-white samurai films such as Harakiri, Throne of Blood, The Sword of Doom, Seven Samurai (currently playing in the background as I type these words), and many more. I had samurai action figures. I vaguely remember having some thin black slippers that I used to call my “ninja samurai shoes” as a young boy for some odd reason. Who knows, man. To this day, one of my favorite literary subjects is the ancient samurai and their lifestyle. It’s endlessly fascinating. And so it was an easy choice. GRXC2 would be based upon the samurai, one of the most iconic warriors to ever roam the planet. And with this selection, I promised myself I wouldn’t cut a single corner and would do everything in my power to do the work this project deserved. Hundreds of hours of work and many sleepless nights would follow.


In a fantasy reality, I would have loved to have made the exterior of the pack out of actual samurai armor plates. Reminds me of Jason’s dream that he told me a decade ago, to have the GR1 made completely out of steel. He was joking. Mostly. But, as you can imagine, an all-steel or all-samurai-armor GR1 just isn’t realistic. For all the reasons. 

So I researched the clothing that samurai wore underneath their iconic armor, called ​​Yoroi Hitatare (essentially a shirt and pants). These would be worn for comfort, as iron plates against the skin would not be very comfortable to wear into battle. Traditionally, these garments would be made from either cotton or linen, depending on the region’s temperature for successful growing of either crop. When these battle uniforms were damaged by wear or an opposing foe, they would not be discarded. They would be repaired.

In Japanese pottery, there is a process called kintsugi, which focuses on repairing broken vessels. Rather than throw away a shattered vase, it is repaired with a mixture of lacquer and silver, gold, or platinum powder. To summarize the concept, the object becomes more beautiful now that it has been broken, telling the story of its history, while also becoming physically stronger. The roots of this process stem from the philosophy of wabi-sabi, focusing on the perfection of the imperfect. 

Now, the above section on kintsugi and wabi-sabi are relevant because there’s a similar Japanese repair process which focuses on fabric and comes from the same mindset. This is called sashiko, translating to “little stabs”. This craft dates back to Japan’s 17th century Edo Period, the particular time where samurai rose to their peak in power, fame, and wealth. The sashiko process uses a thick thread to join two layers of fabric together, each short stab and weave done by hand with a needle. This process makes the fabric stronger and more durable so samurai could wear their Yoroi Hitatare another day.

Okay, history lesson over.


The fabric.

This concept had been in my mind for several years, but it seemed too impossible to achieve. But once I had finally made all the right connections, the fabric took 19+ months to develop from start to finish. 

Inspired by the samurai’s Yoroi Hitatare, I sought to use the best example of Japanese cotton fabric for the GRXC2’s exterior. Luckily, if there is one country in the world that holds the crown for expertise in the manufacturing of cotton in its tough everyday form of denim, it’s Japan. For decades, Japan has been the leader of traditionally made selvedge denim on old Toyoda shuttle looms as well as paving the way in denim innovation. Along with being a carry addict, I’m also a massive denim-head, owning several pairs of brutally heavyweight Japanese denim. If you’re not familiar, I warn you to be careful about going down this rabbit hole.

From my experience in denim, I know the names of dozens of high-quality denim mills in Japan… but that’s it. And Japanese denim mills are widely known for being incredibly secretive to protect their unique processes and methods. So getting in touch with a great mill, let alone any mill, wouldn’t be easy. I put out a Hail Mary into the world. And waited. Luckily, a friend of mine and member of our Carryology community, Lucas Cooper, came in super clutch and responded almost immediately. If I’m a denim-head, Lucas is the denim master, running a group called Selvedge Quality Supply, basically denim’s Carryology. Not only did Lucas have a contact to share… he had the ultimate contact.

Japan Blue Co. Ltd. is located in the sleepy coastal town of Kojima which is famously known for high-end textile manufacturing, and is considered one of the top denim mills in the world. For those in the know, the legendary Momotaro (founded in 2005) denim brand is under the umbrella of the Japan Blue Co. Ltd. group (founded in 1992) as well as Japan Blue’s eponymous denim brand (founded in 2010). Both brands are the only two denim brands in the world that produce everything under the same roof, from start to finish

From cotton harvesting, to spinning thread, to weaving the denim, dyeing, cutting, manufacturing. Everything. This is top-tier stuff, second to none. And here I am, a mere peasant, at the feet of the denim kings all the way on the other side of the planet, asking for something they’ve never done before. There was one shot to do this correctly. Polite formal exchanges are made. Not only did they reply. They were interested in my ridiculous request… to develop a custom denim to exacting specifications. 

The specifications were based on performance first, aesthetics second, no compromise. If Japan Blue couldn’t hit the mark, the fabric wouldn’t be suitable for a rugged durable backpack that could go on proper rucks. So I was extremely specific with my request. I wanted a 15.5oz minimum final weight (per square yard). Black on black. And with an additional sashiko stitching process added to the base fabric. While this is somewhat technical talk, to put it in layman’s terms, this is an incredibly difficult ask. Frankly, this is impossible for most mills. I was surprised they even agreed to try. My contact at Japan Blue said he was highly skeptical, but he would run some trials to see what was possible. No promises were made.

Weeks later, the first swatches came back, with different sashiko stitch patterns and variations to choose from. The only problem? They were all only 11oz denim and some were even less. For those not in the know, 12oz denim is serious stuff, a solid benchmark suitable for tough quality denim jeans. But 11oz wasn’t near enough. This is a GORUCK x Carryology collab, after all. Politely, I provided my feedback on the sample denim swatches in their various black dyes, washed and unwashed. And I asked to increase the overall weight. The reply didn’t sound hopeful, but Japan Blue promised that they would try. 

The next sample swatches came weeks later. The dye was even darker black. The sashiko stitches were to my exact spec. And the denim was indeed heavier, as requested. But it was only 13.5oz. These swatches came with a rather final note that going heavier wouldn’t be possible:

“It’s very experimental method. Actually, there are no mills who can produce 15oz denim with SASHIKO texture what you want to reproduce all over the world because there are no weaving machine to weave such a too heavy denim. Even if target weight is 15oz, there are no mills who can make it.”

We made it this far. So close. But anything less than wouldn’t suffice for this project. I pleaded via one last formal polite exchange, thanking my contact for all of his hard work, telling him if we didn’t hit the 15.5oz weight… all this work would be for nothing.

A few weeks later… a sample swatch arrived.

Black on black Japanese denim, with sashiko “X” stitches in heavy black thread.

And it was 15.5oz heavyweight.

Approved for production.

Success, we did it.

Well, sort of.

No celebrations just yet.

Fun fact: You might have actually spotted some of our custom denim being used on jeans out in the world. Well… the first half of our denim, anyway. We took it another step further. 


Unless you’ve been living under a rock since the 1860s, you’re probably familiar with denim jeans. Denim breaks in, gets softer to the touch, all while still remaining tough for everyday and outdoor activities. But for a backpack? It soaks up water like the cotton sponge that it is. And our custom-made Japanese sashiko denim? There’s even more of it than your traditional denim jeans, 15.5oz of cotton sponge to be exact, all ready to soak up rainfall. So this is when this fabric gets wild and technical and groundbreaking. 

I reached out to my waterproofing textile expert friend, located 7,000 miles away from the Japanese denim mill, in a small town in Connecticut. His name is Taylor North and he’s the Head of Technical Fabrics at Dimension Polyant. Myself, and Carryology Senior Editors Brandon Vulaj and Laurence Fry, all headed up to meet with Taylor, with some sample denim yardage and a whole lot of hope. We had all this traditional custom-made denim and now it needed advanced technical processes to make it perfect. Now, we’ve worked together on custom stuff with DP in the past, but this one is pretty far out… even for us. So when we handed Taylor the fabric to inspect, his inquisitive silence felt like it lasted hours. He breaks the silence, “Sure, we can do this, let’s figure it out.” 


What we asked for was lamination and a DWR face finish so our custom denim would be properly waterproof. Not water resistant, but waterproof. Taylor North came up with the ultimate recipe and process to bring it to the next level. Nerd technical talk ahead, be warned:

On the back of the fabric we used a 50d solution-dyed black polyester taffeta fabric. Between the taffeta and the denim face fabric is a 0.25mil Dimension Polyant film to make the fabric 100% waterproof and provide performance by way of stability, and the unique X-Pac hand feel. It’s bonded together with Dimension Polyant’s (proprietary) Performance Adhesive, which is a high-performance thermoset (permanent) adhesive system – think a two-part chemically cured system. As opposed to a thermo-plastic (think hot glue) or water-based (think Elmer’s glue) system. Simply the highest quality adhesive available for lamination. The same adhesive that has been refined in Dimension Polyant’s yacht sailcloth for decades. 

On the surface of the denim, we top-coated the denim face fabric, again with Dimension Polyant’s Performance Coating to increase the durability and abrasion resistance of the face fabric. The final step was a DWR (durable water repellent coating) that overachieves when it comes to durability and water, dirt and oil repellency. This custom DWR was developed with a Connecticut-based company near Dimension Polyant HQ. 

The result? A fabric that is waterproof, even more durable and even stronger (an impressive 290lbs/in tensile strength in warp and 250lbs/in tensile in the weft), weighing in at a hefty 17oz per yard. A traditionally made heavyweight sashiko denim made by the experts at Japan Blue in Kojito, Japan and then elevated into a performance fabric of the future by the technical scientist masters of Dimension Polyant in Putnam, Connecticut, USA.


Like denim jeans, this fabric will develop its own fades, stacks, and patina which are unique to the life and activities of each unique owner. In fact, being a denim-head, I’ve waxed some of my selvedge jeans in the past for a pretty wild result. It’s definitely not for everyone. Maybe a few years down the road, I’ll use some wax on my GRXC2 Samurai for a custom look and feel. We’ll see if I’m brave enough. 

Looking forward, we are incredibly excited to see the different wear patterns from users around the world in the coming months and years as these packs go on adventures with you. #GRXC2Fades, anyone?

All in all, this fabric took 19+ months of development from start to finish.

It took two expert teams at two different suppliers from Japan and USA.

It’s over five times more expensive than 500D Cordura nylon. 

It’s more expensive than Challenge ULTRA 800. 

It’s more expensive than Dimension Polyant X-Pac X50 Tactical. 

It’s more expensive than Dyneema CT5K.18/wov.32c. 

It will never be produced again.

And it needed its own fancy technical product name.

We call it…

JPXDP 17oz Black Samurai Sashiko.


To complement this black-on-black custom performance denim, we added leather. Samurai used leather because it was tough and flexible.

Leather features on the pack’s bottom panel, the padded grab handle, and the shoulder strap attachment (over top of the webbing). This smooth grain leather feels buttery soft against the skin and will age beautifully, no matter what you throw at it. 


To line the pack, we wanted something that would be water-resistant against spills, durable, tough, and tell a story. 

It was unanimous, we selected Cordura’s 500D nylon for the liner, a fabric tougher than some brands use for the exterior pack fabric. 

Normally, we opt for a bright orange liner. But not this time. In homage to the theme, we selected an iconic samurai color, vibrant red. 

And then… we had the fabric printed with our own custom-designed Carryology geometric pattern called auxikko. Our design is directly inspired by the Japanese geometric pattern kikko, which is the word for samurai armor plates as well as the word for the pattern of a tortoise shell, both being visually similar to one another.

Custom auxikko-printed high-vis samurai-red Cordura 500D nylon liner, done.


GORUCK’s zipper pullers are some of my favorites in the game. They’re ultra-minimal, strong, and work well with gloves. So we didn’t want to reinvent the wheel. But 550 nylon paracord hanging against our JPXDP 17oz Black Samurai Sashiko just didn’t make much sense visually or in concept. I was kind of stumped on this one. My answer was to hop in our Toyota and drive down to San Antonio to the San Antonio Museum of Art, where there’s a fantastic example of Edo-period samurai armor on display. Staring into the hollow empty eyes of the ronin’s fierce mask, I was grasping for inspiration… and of course, it was right there in front of me: Samurai would use braided silk rope to attach various pieces to one another, keeping it all together in a protective, easy-moving, and evil-looking suit. 

Why silk? Well, they didn’t have Fidlocks or Cobra buckles back then. Silk was relatively abundant in Japan at the time, even if it took some effort to produce. Pound for pound, it’s stronger than steel. How strong? Here’s some fancy math numbers. Typical commercial silkworm silk has a tensile strength of about 0.5 gigapascals (GPa), a breaking elongation of 15%, and a breaking energy (toughness) of 6 × 104 J kg−1. Aside from its strength, it’s incredibly soft against the skin and flexible too. Basically, braided silk rope is the grandfather of 550 nylon paracord that we use today. 

We hunted down a specialty supplier in Japan which was no easy task, then did some strength testing and color approvals. We loved it and selected black and then red for the internal label pocket and the exterior quick-access pocket. Of course, we did the same shrink wrap like the OG, to keep it all tidy and glove-friendly. And as a nod to custom, we made the ends of the rope extra fluffy, just as the samurai did. All the benefits of the original GORUCK paracord zipper pullers, with a performance luxury silk twist.


Our challenge here was to better the GRX1’s patch. A patch designed by Dan Matsuda and laser engraved by Marc Mummert on titanium. It would be no small feat, but the result is something we’re incredibly proud of. 

The hunt for the artist

We wanted a Japanese tattoo artist to create the design for this project. I posted to all of my personal social media accounts, casting the widest net possible. I even asked my Kyoto-born Austinite tattooed rockstar chef friend Yoshi Okai, who tried but couldn’t come up with a connection. 

After weeks of searching and feeling pretty defeated, another Carryology community member came to the rescue. Mike Maceda, a softgoods designer, personal friend, and rad dude, dropped me a line and connected me with the name of his tattoo artist. I was told he speaks good English but his first language is Japanese. But he warned me that this gentleman doesn’t accept just any projects. He’s particular. Just our kind of guy, I thought. 

Jiro Yaguchi was born and raised in Japan, is now a Los Angeles resident, and is an incredibly talented artist to a level of fame, and resident tattooer of Onizuka Tattoo. Wanting to adorn his inkwork on your body? Prepare for many months to wait for his first availability. Possibly even longer than a year. 

At first, Jiro-san politely declined the project, stating something along the lines of this project was “a bit too basic for him.”  

“Okay… I like this guy”, I thought, while smiling from ear to ear. Quickly, I messaged back with a more detailed pitch, including all the intricacies as well as the name of the craftsman patch maker (we’ll get to that next). 

Immediately he replied.

He loved it and he was all in. 

It took a couple of weeks, but Jiro-san sent over his final design. It was bold. A red background with a fierce black silhouette. He went on to explain the many different references he included in his small but impactful piece of art. First, his overall inspiration came from samurai movie posters from the 1950s-1970s. He specifically mentioned posters for films made by Akira Kurosawa, who is widely regarded as one of the most important and influential filmmakers in the history of cinema (Seven Samurai, Throne of Blood, Sanjuro, among many, many more). 

For the character himself, he blended two of his favorite samurai warriors. The most eye-catching element on the design for most is likely that wild-looking helmet. For folks who know their samurai history, yep, you guessed it, that’s Toyotomi Hideyoshi’s iconic helmet. Known as the man who unified Japan, he came from a simple peasant background and eventually became the de facto leader of Japan and acquired the prestigious positions of Chancellor of the Realm and Imperial Regent by the mid-1580s. Jiro-san has a particular fondness for Toyotomi, with a replica helmet of his located in his tattoo studio, which he showed me when I visited (bottom right of the image above).

The other samurai inspiration, none other than Miyamoto Musashi. He was not officially a samurai as he never held his own lands or served a lord as a formal samurai, but as a duelist, none can compare to Musashi. Arguably the best swordsman to ever walk the face of the earth. Undefeated across at least 60 duels, he founded multiple schools of swordsmanship and, later in life, wrote The Book of Five Rings, which is still read today for insight into his tactics and philosophy. 

The visual element that represents Musashi is the iconic dual swords he is wielding, as he was the first to invent this method of swordsmanship. 

In 1612 he fought his most famous duel, which was against Sasaki Kojiro, known as “The Demon of the Western Provinces” and considered the greatest swordsman of the time. Musashi aggravated his opponent by intentionally arriving at the tiny island of Funajima, the mutually agreed-upon battleground… nearly three hours late. In the course of a fierce but brief duel, he struck his katana-wielding enemy dead using nothing but a wooden sword he’d carved from an oar on his way to the island. 

The artisan

This part still gives me chills. Every component of the GRXC2 Samurai was in place, but we were missing the final critical element… who would physically bring this artwork to life? And how would they do it? It had to be a method that paired with the concept. 

At first I thought, let’s find a craftsman in Japan who would brand the design into a leather patch. My imagination ran wild with the visual imagery. The iron brand sitting in glowing hot coals, the flames and smoke rising when depressed into the leather, I could smell it. But I took a step back. This was all just romanticized in my mind. It had nothing to do with samurai.

Back to the drawing board. I began looking up samurai armor makers. I discovered several options that weren’t a great fit. Some were movie prop designers, most were generic Halloween costume companies, and a few were actual makers. And then there he was… Tatsuhito Imamura-san of Kyoto Armor, located in Kyoto, Japan. 

Tatsuhito-san is recognized by the government of Japan, officially certified by the Minister of Economy, Trade and Industry as a Traditional Artisan. His craft has been passed down from generation to generation, a lifelong dedication to doing things the old way. Let me put it in a way that puts some economic value on his works. If you’re interested in purchasing one of his miniature scaled-down (about 3 feet tall) full sets of samurai armor it will run you ¥2,000,000 (approximately $15,000 USD). 

They’re all currently sold out on his website. He is considered the best living samurai armor maker in the world. And that was the problem. I knew his name. It’s like knowing Michael Jordan’s name when you’re at the local park and thinking he’d like to join your pickup squad. Just because you’re aware of them, does not mean you’ll get to call upon them.

A third Carryology community member to the rescue. This time, a dear friend, Daniel Yeoh, who resides in Japan. Daniel knew what I was up to, as I reached out to him for some help. Luckily, by pure chance, he had personally put together a small group buy in our Carryology Classified community for some samurai armor amulets made by Kyoto Armor. I honestly didn’t expect much to come of my request. Yet, he came back a few days later with news that struck me like a thousand bolts of lightning. To my bewilderment, Daniel told me we had a video meeting scheduled with Tatsuhito-san the following week. Jaw, meet floor. Floor, meet jaw.

I pinched myself to make sure this is real. On my screen, Daniel (acting as translator), myself, and Tatsuhito-san. He’s wearing a faded indigo kimono, seated in his Kyoto Armor workshop, 7,000 miles away from my Carryology home office desk in Austin, Texas. Soft-spoken and incredibly friendly. He bows sincerely to his laptop camera, a respectful greeting. I describe the project to him via Daniel and express my extreme honor to simply be speaking with him, with the possibility of working together. He replies, delayed as Daniel repeats to me in English. Tatsuhito-san says that he deeply appreciates my interest in his work and thanks me for helping bring his dying art into the eyes and hands of a new group of people, located around the world, who will now get to own a piece of his craftsmanship. 

Pitching the specifics of the size constraints, Velcro-backing, and deadlines, I think that there’s no way this will work. He goes on to explain how he will make them by hand, using 2”x3” raw iron plates and then coat them with a hand-harvested tree sap in the traditional urushi-e method. Urushi-e (or Japanese lacquerware) offers a finish that is very durable and resistant to water, acids, and heat. He goes on to explain this is the exact method by which samurai armor has been made for centuries. And funny, our 2”x3” patch sizing is even the approximate size of a single scale of armor, which would be overlapping other small armor scales, attached together via braided silk rope. 

It only took one round of samples. They were perfect. Handmade samurai armor morale patches, made by the world’s best samurai armor maker. 

Note: While this traditional handmade in Kyoto armor piece has extremely high strength properties, its high gloss surface will show scuffs and marks if rubbed up against hard/textured surfaces. Store it away safely to keep it perfect or let it develop a battle-worn patina from your adventures, the choice is yours.


All of the components were in place. 

Now normally, when the first sample is made, it is shipped out, then examined by the partner brand and then examined by myself and our team. Not this time. I asked the folks at GORUCK to let me know the exact day the factory would be finished and we both booked flights to go view this thing in the flesh. Upon the final reveal, I can say with absolute seriousness, I had goosebumps. It became clear at that moment, after more than two years of design and development, the GRXC2 Samurai was finally ready to be released into the world.

Introducing the GORUCK x Carryology GRXC2 Samurai GR1.

Based on the Carry Awards Hall of Fame winner, GR1 backpack. And the second chapter of the GRXC project with GORUCK and Carryology.

Inspired by the Samurai warrior. Made in the USA with Japanese and USA materials.

Built from a completely custom technical fabric: JPXDP 17oz Black Samurai Sashiko. A collaboration between Japan Blue Co. Ltd. and Dimension Polyant. Custom-made 15.5oz black x black sashiko denim, made in Japan, and laminated by Dimension Polyant for waterproofness and durability. 

Black leather base, grab handle, and shoulder strap details.

MOLLE webbing on extra-padded shoulder straps.

Custom Auxikko geometric pattern printed on hi-vis red 500D Cordura nylon.

YKK zippers with glove-friendly Japanese braided silk rope zipper pullers.

Samurai artwork designed by Jiro Yaguchi of Onizuka Tattoo in Los Angeles.

Morale patch handmade by Tatsuhito Imamura-san of Kyoto Armor in Japan.

One-time release only, never to be repeated.

GR1 21L and GR1 26L sizes are both available.

The post GORUCK x Carryology GRXC2 | The Samurai Rises appeared first on Carryology - Exploring better ways to carry.

Older Post Newer Post