Stem Cell is a weatherproof stem-mounted bag ideal to keep frequently used items within easy reach while riding, available in 2 sizes. The draw-cord closure can be operated with one hand and, when open, creates an extension tube allowing taller bottles or stove systems to fit snugly inside. The hood provides extra weather protection when required and can be folded away into its own pocket for easier access on fair-weather rides. Stem Cell uses hard-wearing waterproof fabrics to protect your kit from all but the heaviest rain. Built to last by hand in our UK Factory with a 25-year Alpine Bond.


Weatherproof construction

Waterproof X-Pac® X11 and Cordura® fabrics for all-weather riding

Stowable hood

Protective hood folds away into its own pocket for easier access in dry weather

One-handed access

Cord lock extension tube can be operated by one hand while riding

Built to last in the UK

Reinforced construction with abrasion and tear resistant fabrics, backed up by our 25 year Alpine Bond

Product overview

  • One-handed cord lock for accessing items on the move
  • Protective hood folds away when not in use
  • Expansion tube for storage of taller bottles and stoves
  • Secure Velcro loop attachments to stem and bar
  • Additional fork crown attachment point can be used for added stability
  • Waterproof X11 and Cordura® fabrics (not seam-taped)
  • Attaches to either side of the stem
  • Handmade in our UK Factory
  • 25 year Alpine Bond

Technical details


Exterior: X-Pac® X11 3-layer laminate (100% organic cotton duck / recycled polyester X-PLY / polyester film backer), 1100D Cordura® nylon, hypalon, aluminium buckle
Lining: 222D nylon with PU coat


Regular: 28 x 12 x 10cm, 1.8 litres
XL: 32 x 14 x 12cm, 3 litres


Regular: 106g
Straps (x2): 10g


United Kingdom

Sustainability & Care

Environmental impact

Organic cotton

X-Pac® X11 fabric uses a hard-wearing 100% organic cotton face fabric. Organic cotton farming produces significantly less CO₂, uses less water and eliminates the use of harmful pesticides.

Climate neutral fabric

X-Pac® X11 fabric is certified by cleenTEC® as being 100% climate neutral. X11 is made from a mixture of plant-based and recycled materials and manufactured in factories using only green energy.

Care Advice

The Stem Cell has a DWR coating which helps it to repel water and dirt. After your ride, wipe down your bag with a damp cloth to remove dirt or use mild soap on more stubborn muck. Leave to air dry.

Size Guide

Stem Cell Cockpit Bag Size Guide

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