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Stem Cell Dry accessory bag

Waterproof stem-mounted accessory and bottle bag for keeping your essentials accessible yet dry; UK-made to last

Stem Cell Dry stem mounted bar bag
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When you’ve made the trip to Norway for a week off the grid, the forecast for downpour isn’t exactly going to put you off. At least your stuff will stay dry…

Stem Cell Dry provides easy-to-access waterproof storage for the stuff you’ll need frequently during your ride.

Constructed from waterproof VX21 fabric with a minimalist design in our UK factory, Stem Cell Dry is made to be hardwearing without adding weight to your setup.

A taped waterproof insert and roll-top closure keeps your stuff dry; padded walls give added protection.  

A webbing ladder offers endless attachment points; simply cut the VELCRO® strap to size.

The roll-top closure creates a 13 cm extension to fit a 600 ml bottle or 750 ml Nalgene; the Stem Cell also fits a Mytimug 650.

Key features
  • 25 Year Alpine Bond
  • Easy-to-access storage
  • Made to last in the UK
  • Fully customisable (contact support@alpkit.com)
  • Made with waterproof and highly abrasion-resistant fabrics
  • Waterproof insert and roll-top closure for added protection
  • Minimalist design for lightweight storage
  • Roll-top closure maximises capacity
  • Padded walls protect your stuff
  • Bar-tacked webbing ladder for endless attachment points
  • Attaches to either side of stem
  • VELCRO� strap provided
More images
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Vital stats

Fabric: VX21
Taped roll top closure
Stitched seams
VELCRO® strap provided


Weight: 75 g
Dimensions (min/max): Ø11 - 12 cm / Ø11 - 24 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.


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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.


4 Reviews


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Mike F
Stem Cell Dry

Excellent bit of kit wizardry as usual from ALPKIT. I have used this for months now in all sorts of weather and not once has it leaked or let me down. I have had no problem with the inner liner as another reviewer mentioned. I use it store my phone, keys, bike tool and the all important Haribo's. Despite some cruddy rides I just let the bag dry out naturally and then brush off the dried mud with a soft toothbrush. Comes up a treat. Fab bit of kit for the price. 5 stars from me.

Rob H
Expensive but perfect for my needs.

I bought one of these to act as an accessible case for my micro 4/3 digital camera. With the addition of a circle of Karrimat material to the base it is perfect for my needs, whether on the handlebars, climbing harness or ruckstrap straps. It's waterproofness was confirmed when I foolishly popped it in the dog's panniers and he took it for a lake swim.

Very handy

This is a great piece of kit that I can’t believe I managed without. I’ve just taken it on a 3 day cycle along Hadrian’s wall in *ahem* variable weather, and this kept my phone, my camera and most importantly my wine gums dry and within easy reach. A worthwhile addition to your bikepacking setup.

Andy Pryke
2 day outing in the Alps

Was really expecting these to be good, but afraid not.
3 Gripes
1 - the lack of a round base, unlike the regular stem cell, means they do not pack as well (Its really square)
2. the lock over top sticks up too high, and interferes with other items in the cockpit
3. The liner keeps coming out when unpacking what a pain

No such problems with the regular stemcell - I can't say this is worth the extra money.

On another note the really! really! harsh Velcro, has already started to wear a hole in the outer bag after only two days, and has trashed another bit of kit, put it on soft side inside (no Scratching the bike, but damages the kit, put it on soft side outside, it scratches the bike paintwork!)