First Look: Känguru's Marsupial Pouch DIY Frame Storage Conversion Kit

Apr 1, 2022
by Mike Levy  
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Own a frame that doesn't have downtube storage? Kanguru's $1,999 USD Marsupial Pouch DIY conversion kit might be the answer.


We've seen a lot of clever products and had too many why-didn't-I-think-of-that moments to count over the years of attending tradeshows and launches, but none of the Pinkbike tech team can recall an idea being this revolutionary and game-changing. ''I don't recall anything this revolutionary and game-changing,'' Mike Kazimer whispered softly to me after first seeing the Marsupial Pouch DIY Frame Storage Conversion Kit, or MPDIYFSCK for short. ''The only thing that comes close might be disc brakes,'' he went on to say.

While there had been storage solutions on the market long before Specialized debuted the 2016 Stumpjumper with SWAT, that little plastic door opened up an entire carbon downtube's worth of carrying space and the idea that we don't need to look like we're in grade six and pedaling our bikes to school. Instead of sweaty backs and uncomfortable straps, we could put our every-ride carry items down low and hidden from sight inside the frame. It just makes sense.

Other bike companies are offering their own versions of frame storage now, some with their own little plastic doors and others carried externally, and I imagine most brands will be ticking that features-list-box in the future. But what about the thousands and thousands of frames that are already on the market and, like nearly obsolete dinosaurs, weren't blessed with downtube storage when they were manufactured? Doesn't that mean your frame is absolute garbage and needs to be thrown into the ocean? Maybe not, because that's where the Marsupial Pouch DIY kit comes to the rescue, says founder and designer Klaus Berenstain.


Specialized 6fattie review test
Trek Fuel EX 9.8 GX Photo by Dane Perras
Specialized and Trek both offer in-frame storage on their carbon and aluminum bikes, but Kanguru says they're on a mission to let anyone with a mountain bike enjoy the same benefits.


''I remember being a small child and watching people struggle to carry things while riding their bicycle,'' Berenstain told me when I asked where his burning passion for storage solutions came from, ''I knew from the age of two or three that I'd dedicate my life to this issue,'' he went on to say in a rambling 20,000-word e-mail.

Berenstain explained that he worked on perfecting his design through the 1990s and that several companies offered him ''Vast sums of money,'' for his idea. The hold-up? ''This is my baby, the reason I'm here, and I needed to be the one to raise it and set it free,'' he said in a 2am WhatsApp conversation. Klaus also stressed that it took many years to design and engineer such a highly specialized product, especially as he has no formal training or education in this or anything else. Years of sketches and dead-ends almost had Berenstain giving up on his dream, but then a chance encounter on the trail changed everything. ''I was on a ride and saw a very rare European short-legged tree kangaroo, which has been nearly hunted to extinction due to their incredibly soft pelts that roadies love to use for their chamois and because they're so delicious,'' he explained. ''It was carrying a baby in its marsupial pouch, and I immediately thought, 'how could I carry a small a small animal inside my frame?'''


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Pre-production samples of the Marsupial Pouch DIY kit. Berenstain expects the final version to be marginally nicer.


The DIY kit consists of a sharpie and a paper template for whatever shaped hinged door you've ordered, the 3D-printed door itself and a small tube of Super Glue to attach it, some safety glasses, and a high-RPM, 15 AMP corded angle grinder with a 7" serrated cutting disc.

While I'm sure we can all applaud the idea of carrying more things on the bike and fewer things on our bodies, what about the nagging suspicion that grinding away a large section of your downtube might affect the frame's ultimate tensile strength? ''It should be all good, dawg!'' Berenstain countered.

The German brand has templates and doors to fit many different makes and models, and Berenstain also has plans to eventually offer a freehand kit that would allow customers to draw any shaped door anywhere on their frame and of any size. ''DOOR UP TO CUSTOMER,'' Berenstain screamed before hanging up after calling me at 4am.

Känguru expects the first production run of the $1,999 USD MPDIYFSCK to be available for pre-orders on April 20th, with orders shipping before 2024.

Author Info:
mikelevy avatar

Member since Oct 18, 2005
2,032 articles

65 Comments
  • 149 1
 Working on a sandwich press that smashes your lunch into brand specific tube diameters. Taking pre orders since the idea came into my head and hoping to raise 250k on kickstarter for more r&d drugs.
  • 23 0
 Would that work for herbs and fungi too? Asking for a friend. And Henry.
  • 9 0
 Now that’s a good April Fools article
  • 7 0
 Burrito has entered the chat
  • 3 0
 @KK11: The real April Fools is a Mike Levy byline that isn't a podcast.
  • 1 0
 @Woody25: I think it would ONLY work for Henry AFTER the shrooms.
  • 40 1
 This is perfect, I can cut out the big crack in my carbon frame and replace it with this. Hey presto, a structurally sound frame AND in-frame storage. Win-frikkin-win baby.
  • 5 1
 guess your strain of bad luck finally came to an end! And all of that for just two grand...
  • 7 0
 It still saves you having to buy a new frame, I just hope someone takes the idea and produces a cheaper alternative because let’s be honest the price is a bit of a joke.
  • 23 1
 If it's Känguru then it's an Aussie thing right? If that's the case then why isn't the box on the underside of the downtube?
  • 5 0
 Aussie 2.0 . . . Austria
  • 1 0
 The screws thread in backwards.
  • 13 0
 And they said there wouldn’t be headphone jack in your iPhone if you drill a hole in the perfect spot..
Stick it to the man!
  • 5 1
 Okay, so storage in your bike frame is a good idea, but I’m interested in adding a compartment in my body so I can store my wallet, keys, etc …

Think about how this would useful:

You go to the beach, you’re about to go for a swim, and you see some unsavory folks walking around. No problem! Just open your “Body Cavity Compartment” (BCC, trademark pending) and drop in your valuable!

Waterproof, theft proof, hermetically sealed, and only you know what’s in there. For the bigger folks there’s an XL version that has space for carry out of your favorite conceal and carry Smile
  • 17 0
 I think you already have one .
  • 6 0
 It's called your prison wallet
  • 11 0
 It's been done; you can open up your Accessible Storage System anytime you like and pop something in there. I'd probably steer clear of the Desert Eagle though.
  • 7 0
 srsly?? 1999$ and the screws are not included? what a joke!
  • 3 0
 such a great product idea, but the angle grinder will not not do the job. It would need a marsupilami-tail-puncher to get a statically stable cutout (technically it's a punch-out).
  • 3 0
 I think if you swap in titanium bolts, the weight gain would be negligible, b/c you're taking out structural carbon and just replacing it with plastic. Seems like a good idea that even weight weenies can get behind.
  • 1 0
 Shoot, I wish I saw this a few weeks ago. Arghhh!! I already tried my own DIY version of the SWAT door and totally screwed up my frame. It is likely toast, however, I may be able to salvage it with some 2-Ton epoxy. Crossing my fingers.
  • 2 0
 This is great. In fact my next bike will be decided by the the size of the down tube. The bigger the better. I've got so much stuff to carry now, I'm looking forward to having a sea kayak on wheels.
  • 4 0
 All good all good, but we would like an example
  • 1 0
 Disappointing not to have a final result picture
  • 4 0
 Cue a bunch of Swedes wondering how the hell the name came about
  • 1 0
 This is impressive but can these be made for tires & handlebars too? The tire option would allow more storage AND provide some additonal traction once per rotation…
  • 8 0
 Also easier to add sealant with a door.
  • 3 0
 @JSTootell: Seems pretty obvious but hey - we're just plebs. What do we know...
  • 1 0
 "It was carrying a baby in its marsupial pouch". This article was clearly written by a Känguru ignoramus as they're quite obviously called Joey's.
  • 3 0
 I am ordering 2, double the storage!
  • 1 0
 If it came with a cordless angle grinder ... I'd jump on it.
Does anyone know of a DIY handlebar burrito bag kit? For storing bulkier items.
  • 1 0
 I routed all the cables and dropper post through an old Banshee Spitfire. My set up for drilling the holes looked about the same! Worked out awesome in the end.
  • 1 0
 Well done PinkBike, Well done. This had me pulling my hair out until I realized the day.
  • 2 0
 Please do a kickstarter at 1699$.
  • 2 0
 I could have sworn his name was Klaus Berenstein!?
  • 2 0
 Missed opportunity to change up the spelling at every mention
  • 2 0
 This is the type of shit I want on the PB homepage every day of the year.
  • 2 0
 " I'm a Joey, and it's my 1st time here!"
  • 2 0
 Price is too low I'm not sure it's safe.
  • 2 0
 I forgot what day it was. ‍♂️
  • 2 0
 I see a DIY project in my future
  • 1 0
 I accidentally cut my frame in half . Is there a kit available to fix this ?
  • 1 0
 It needs a water bottle holder in it. I just made their first improvement. I expect a free everything now. Thank you
  • 2 0
 £2000 what a bargain anyone got the site you get this from
  • 3 1
 fantastic april fool
  • 2 1
 April 20th ? Is that a slick 420 reference ? I’ll let you decide
  • 6 0
 Also Hitler's birthday, so make your own mind up about this German brand.
  • 3 0
 @AyJayDoubleyou: surely that would be 204 being he is from europe?
  • 2 0
 stop it
  • 2 0
 no demo video? pity..
  • 2 0
 take my money!
  • 1 0
 Should have done the teaser shots of the dropper stem
  • 1 0
 Thank you - this made my day.
  • 1 0
 Cut every other spoke on your wheel to save weight.
  • 2 0
 I hate April.
  • 1 0
 Will this work on a seatpost tube?
  • 3 4
 How could you put something this stupid on your site.
  • 5 1
 April fools, got me
  • 2 1
 Maybe you need to check your calendar
  • 2 0
 @nurseben: I'm a little slow sometimes
  • 1 4
 Please delete before some chud screenshots that image, pops it out their mom's laserjet, and goes and DIYs their 4k frame into oblivion... LMAO
  • 1 3
 they had us in the first half, not gonna lie
  • 3 6
 I see non of these silly April fools are on the Beta.
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