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Stem Cell XLstem accessory bag

Supersized handy stem-mounted bottle/ accessory bag for easy on-the-go access during your bikepacking adventures

Stem Cell Steel

Stem Cell XL stem accessory bag

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  • Steel - Stem Cell Steel
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    Flo Orange
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Stem Cell XL has all the quick and accessible goodness of our original Stem Cell, but bigger!

This simple drawcord closure bag has been designed to take our BruKit giving it a great capacity and ability to take items with up to 12.5 cm diameter and 24 cm in height. Perfect for quick and easy access to your BruKit, trail mix or camera.

Constructed from bombproof VX21 fabric, Stem Cells are lightweight but padded. Inside, we have used a hi-vis lining so that you can see stray snacks lurking at the bottom.

A versatile webbing ladder is bar tacked around the Stem Cell to provide multiple attachment points. Secure in place either side of your flight deck with the VELCRO® Brand straps provided. 

Key features
  • 25 Year Alpine Bond
  • Made from durable and highly water resistant VX21
  • Lightweight: 88 g
  • Closure: Elasticated drawcord
  • Made in our own UK workshop by bikers, climbers and paddlers
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Vital stats

Weight: 88 g
Width: 11 cm
Min height: 16 cm
Max height: 23 cm

Origin: United Kingdom

Dimension Polyant fabric is extremely weatherproof but we do not guarantee these bags are waterproof as the seams are not sealed and it has a big hole at the top. On a long ride water may eventually seep through, keeping anything that absolutely must stay dry in a lightweight drybag such as an Airlok is good practice. Custom options: if you would like a bespoke made Stem Cell to match your bike’s colour scheme or you wish to add features not offered on the standard model please give us a call or drop us an email and if we can, we’ll make it for you. We love the challenge!

Free UK Shipping on all orders

Free 2 day delivery to UK addresses is included in all orders so the price you see is the price you pay. Upgrade to next day at the checkout.

Free No hassle 123 Day Returns

Buy with confidence and if you are not happy, change your mind or want a swap for any reason then return it for free and we will exchange or refund no question. The price you see is the price you pay. Just return the kit as you receive it - in its original condition, unused, unworn, with original packaging and fit for resale.


We offer a range of finance options from 0% to 9.9% starting on orders over £500. Please give us a call on 01773 417007 to apply for finance. Our customer support heros will take your order and talk you through the quick and easy application process.

Alpine Bond

If one of our products does not meet your expectations upon delivery or, if it does not live up to the demands placed upon it, please return it within 3 years of purchase for repair, replacement or refund. If the problem is our fault then we will do this to your satisfaction if it’s your fault then we will help out the best we can.
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1 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.