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Stem Cell XL accessory bag

Large stem mounted padded accessory bag spacious enough for a Brukit integrated stove system; UK-made to last.

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This product has been archived and is no longer available for purchase.

No matter how hard you try to pack ultralight, sometimes you just need a bit more stuff to hand; enter Stem Cell XL – a tardis in bike luggage form.

Stem Cell XL provides spacious, easy-to-access, protective storage space for the stuff that you’ll need frequently during your ride.

Constructed from waterproof VX21 fabric with a minimalist design in our UK factory, with protective padded walls to protect your stuff, Stem Cell XL is made to endure the demands of life on the road without compromising on weight.

A bar-tacked webbing ladder offers endless attachment points around the flight deck; simply cut the VELCRO® strap provided to size.

Stem Cell XL is spacious enough to carry a BruKit, camera, a light extra layer, or your lunch; drawcord closure maximises capacity.

"Is it waterproof?"

Although highly weather resistant, this product is not fully waterproof due to its stitched construction. If you are carrying valuables or electronic equipment, make sure to put it in a dry bag. 

Key features
  • 25 Year Alpine Bond
  • Easy-to-access, extra spacious storage
  • Made to last in the UK
  • Made with waterproof and highly abrasion-resistant fabrics
  • Minimalist design for lightweight storage
  • Elasticated drawcord closure
  • Padded walls protect your stuff
  • Bar-tacked webbing ladder for endless attachment points
  • Attaches to either side of stem
  • VELCRO� strap provided
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Vital stats

Outer: VX21
Stitched seams
Elasticated drawcord closure
VELCRO® straps


Weight: 88 g
Width: 11 cm
Height (min - max): 16 - 23 cm

Origin: United Kingdom

Product Care Information

Stem Cell has a C6 DWR coating which helps it to repel water and dirt. After your two-wheeled epic, wipe down your Stem Cell with a damp cloth to remove dirt.

VX21 A 4-layer, 210 denier laminated nylon fabric with a DWR finish: VX21 (or X-Pac to its friends) is a high tech, ultralight sandwich of materials that is highly abrasion and tear resistant, low-stretch, and waterproof.

Product Support Team Advice

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What You Say: Customer Reviews and Comments

2 Reviews


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Stem cell xl

Extremely well made, durable, tardis like bag. The velcro straps make it rock solid. I was initially concerned it would get in the way when climbing uphill, but it doesn't as it sits so snugly to the stem. I've used the stem cell to take a shirt, lunch, keys, and phone to work. I use it every day and love it, do yourself a favour and get one.

Really good but better with straps

Just to say I took two of these across the Great Divide in USA/Canada. They are tough and made to last. Some of my stuff got holes in but these look like new after a spin in the washing machine. My only observation really would be that I found them better when you use some sort of buckle strap to lash them to frame from beneath. I used two straps and fed them through the tops of the forks. This means that they don't flap up and down. Other than that they are great.