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Refuelling with an energy gel, taking a swig of water, capturing a sunset on camera… Some things just can’t wait until you hunker down for the night.

Stem Cell attaches to your bikes' stem to provide easy-to-access storage space for the stuff that you’ll need frequently during your ride. Placed well within reach when you're riding, it works well as a stand-alone bag for day riding or as a part of your cockpit setup on longer bikepacking adventures.

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Constructed from waterproof and abrasion resistant fabrics with a minimalist design in our UK factory, Stem Cell is made to endure the demands of life on the road without compromising on weight.

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

Drawcord closure creates a 7 cm extension tube to fit a 600 ml bottle or 750 ml Nalgene; the regular Stem Cell also fits a Mytimug 650 and the XL fits a Brukit - hooray!

Although being made from waterproof fabric and being 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.

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Key Features

  • Stem-mounted storage that you can access as you ride
  • Made to last in the UK
  • Fully customisable (contact
  • Made with waterproof and highly abrasion-resistant fabrics
  • Elasticated drawcord closure creates extension tube for maximum capacity
  • Bar-tacked webbing ladder for endless attachment points
  • Attaches to either side of stem
  • 75 cm VELCRO® strap provided
  • 25 Year Alpine Bond

Vital stats

VX21 (Chilli, Lego, and Black)

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. Weight: 62 g

500D Cordura

500D Cordura is heavy duty, waterproof and highly abrasion resistant, so we often use it to make hardcore bags without adding extra weight. The clear PU coating repel dirt and water too, giving your stuff a bit of protection and making it easier to wipe down. 


 l Regular XL
Weight 60 g 85 g
Capacity 1.8 l 3 l
Height (back + extension tube) 21 + 7 cm 25 + 7 cm
Diameter (top - bag tapers in at the bottom) 15 + 7 cm 21 + 7 cm
Velcro strap (W x L) 2.5 x 75 c,


Drawcord closure Stitched Seams

Fitting Guidelines


Origin: United Kingdom

Care & Environmental Advice

Product Care Information

​Stem Cell has a 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.

Size Guide

Stem Cell Cockpit Bag Size Guide

Size Capacity Dimensions
Regular 1.8 litres 28 x 12cm
XL 3 litres 32 x 14cm