Our site works best with JavaScript enabled.

Stem Cell Stem-mounted bikepacking bag

1.8 litre stem-mounted bags, ideal keeping your gels, a water bottle, camera, Mytimug, or other riding equipment close-to-hand on your two-wheeled adventures; UK-made to last

Stem Cell 1.8 L stem-mounted bikepacking accessory bag
  • Google+



  • Chilli - Stem Cell 1.8 L stem-mounted bikepacking accessory bag
  • Tarmac Ultra Light - Stem Cell 1.8 L stem-mounted bikepacking accessory bag
    Tarmac Ultra Light
  • Black - Stem Cell 1.8 L stem-mounted bikepacking accessory bag
  • Lego - Stem Cell 1.8 L stem-mounted bikepacking accessory bag
  • Jaffa Cordura - Stem Cell 1.8 L stem-mounted bikepacking accessory bag
    Jaffa Cordura
  • Black Cordura - Stem Cell 1.8 L stem-mounted bikepacking accessory bag
    Black Cordura
1. Select Size

Please select a size. See the fitting guide for size information

In Stock
2. Select Colour

Please select a colour. If your desired colour is not available, you can request a Stock Alert and you will be emailed when the product is either back in-stock or on pre-order.

In Stock
In Stock
In Stock
In Stock
In Stock
Tarmac UL
In Stock
Cordura Jaffa
In Stock
Cordura Black

Please choose an option above

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. 

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 Stem Cell also fits a Mytimug 650. 

"Is it waterproof?" 

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

Key features
  • 25 Year Alpine Bond
  • 1.8 litres of stem-mounted storagethat you can access as you ride
  • Made to last in the UK
  • Fully customisable (contact support@alpkit.com)
  • 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
More images
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

LS07 (Tarmac Ultra Light)

The lightest waterproof and abrasion resistant fabric we use, ideal for your ultralight long-distance racing or bikepacking set-up. A 70 denier Nylon Ripstop backer makes it super tough for its weight.
We make LS07 products without a lining to keep them ultralight. 
Weight: 40 g


Capacity: 1.8 litres
Diameter (top)*: 11 cm (bag tapers in at the bottom)
Height (back): 21 cm + 7 cm extension tube; (front): 15 cm + 7 m extension tube
Velcro strap(WxL): 2.5 x 75 cm


Drawcord closure
Stitched Seams

Fitting Guidelines

Stem Cell has a handy webbing ladder for attachment, you can secure it to your stem using the velcro straps provided.

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.

Product Support Team Advice

Related products

Enduro Seat Pack

3 litre bike saddle day pack


Koala 13

13 L Exo-Rail compatible saddle bag


Glider 46

1.7 litre road and touring frame bag for ultralight bikepacking


Glider 48

2.1 litre road and touring frame bag for ultralight bikepacking


Airlok Tapered 13l

13 L tapered seat pack drybag



0.5 L weather resistant seat pack

What You Say: Customer Reviews and Comments

2 Reviews


Used this product?

Write a review
Paul L
Nice place to keep your Haribos!

Initially wanted a Fuel Pod type frame bag but had concerns over security of attachment leading to contact with my knees. Went for the SC 2 and have used it for the 1st time on a 200 mile road event on my road bike. The bag comes with a single length of what appears to be good quality Velcro type strap so the first job is to cut it into the 3 lengths you're likely to need. The best fit will be achieved on an MTB as pictured due to having a nice wide fork crown to strap down to. Road forks typically are not as wide here and there was also insufficient fork/tyre clearance to add the strap. I simply looped it through the head tube area. For road riding perfectly secure. I filled the bag with the usual assortment of snacks etc and "peeling" the wrappers whilst stationary allows you to eat on the go without any hassle. I can't comment on water resistance as it didn't rain but think any contents would remain dry through a shower providing the drawstring was tightened. In summary, a useful and well made bag that doesn't fall off or get in the way and holds a decent amount of Haribos.

Fills with water?

Handy, minimalist and practical way to add to capacity and separate items for quick access.
However when it rains for long periods of time it fills with water. A drainage hole would be useful. Also on mine the elastic to close it split when I gently pulled it after a few times.