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Bikepacking rigs rarely feel complete without our big volume seat packs to carry bulky stuff. Ditch the sweaty backpack and let the Exo-rail take care of your luggage.

Exo-rail is our unique and innovative system for adding stability and dropper seat post compatibility to seat packs, while reducing faff with its simple slide-on, slide-off pack attachment system. Convenient, light, and sturdy – it's ideal for tackling whatever the road, the track, or the trail throws at you...

The Exo-rail system fits to your saddle rails with minimum faff. The rail itself slots in with your saddle rails and clamps into place with the clamp and bolts provided. Once on it is unobtrusive and elegant, with no moving parts to clang around, so you can leave it on ready for when you need it.

The Exo-rail’s shape allows for multiple attachment options, depending on your pack, your frame, and your preference. Our Koala seat packs, available in 7 litre and 13 litre capacity, now feature a slide-on, slide-off Exo-rail sleeve that is incredibly simple to use and gives your seat pack setup excellent stability.

Will it fit my seat post?

Exo-Rail does not fit all seat posts.

It does fit 2 bolt micro-adjust seat posts with the bolts in line with the bike, including Rockshox Reverb dropper and all Alpkit seat posts. Exo-Rail does not work with single bolt seat posts or posts with side-by-side bolts. Watching the video will help you determine if your seat post head is compatible, but if you have any doubts please send us a link or a photo of your seat post so we can advise.


Key Features

  • Dropper post compatible seat pack mount for all-terrain bikepacking
  • Holds your seat pack rigid and reduces sway for excellent manoeuvrability and handling
  • Clamps into saddle rail for a secure, unobtrusive fit
  • Rail offer multiple attachment options
  • Included: rail, clamp, 2 x clamp bolts
  • Designed and made here in the UK
  • 3 Year Alpine Bond

Vital stats


Pack weight limit: 2.3 kg Weight: 195 g Dimensions: 28 x 43 cm Rail diameter: 6 mm Material: Steel

Origin: United Kingdom