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Stem Cell Stem-mounted bikepacking bag

Stem Cell 1.8 L stem-mounted bikepacking accessory bag


  • Chilli - Stem Cell 1.8 L stem-mounted bikepacking accessory bag
  • Lego - Stem Cell 1.8 L stem-mounted bikepacking accessory bag
  • Black - Stem Cell 1.8 L stem-mounted bikepacking accessory bag

Stem-mounted bags, ideal for food, water bottle, camera, Mytimug, or other riding equipment


1. Colour / Size
Fitting guide
Cordura Jaffa_c_hidden
Cordura Black_c_hidden

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  • Full Description
  • Features At A Glance
  • Care & Environmental Advice
  • Customer Reviews

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 regular Stem Cell also fits a Mytimug 650 and the XL fits a Brukit - hooray! 

"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.  

Product Insight
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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 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
  • 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. 


&nbspl 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

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 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.

What You Say: Customer Reviews and Comments

3 Reviews


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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.

Great bag but I made it better

I have recently returned from a 2200+ mile, 10 week bike packing/touring trip from Lands End to the end of cycle route 1 at the north of the Shetland Islands. Two Stem Cells (Tarmac) were a critical part of my setup. I improved the bags by increasing the size of the mouth of the bags which 'as sold' are greatly constricted by the relatively short length of shock cord supplied to close the mouth of the bag (not that I ever chose to close the mouth of the bags as I packed them to full and over-flowing with packaged food that cannot wet out in rain).

I untied the shock cord and tied an equal length of string into the closure. This bodge worked well, although before my next trip I plan to purchase a much longer length of shock cord rather than rely on un-stretchy string.

‘As sold’ I found it difficult to pass all but small items through the mouth of the bag, when placing them in the bag or removing them from the bag. I wanted to use, and used, the Fuel Pod for smaller but not insubstantial items of food (energy bars and gels, tea bags in plastic, coffee bags, hot chocolate in plastic, apple, banana, cheese, biscuits, peanuts, chocolate bars ... and polo mints for the ponies and horses). A critical use for the bags was to carry a one or two pint plastic bottle of milk the final miles of a days cycling - between the last shop before I stopped and the camp site or hostel (in Shetland there is often one or at most two shops per island).

The Stem Cells modified in this way are the ideal place for a bike-packer to carry milk (the other items temporarily displaced). More satisfying than using his/her ultralight back-pack or strapping it to the front of the handlebar bag.

I have informed Alpkit of the above, and they are looking into it - the design I mean, not the bag!

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.

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