Big Papa

17 litre expedition seat pack


17 litre expedition bikepacking seat bag. Hardwearing, large capacity, exo-rail compatible with additional bungee cord for keeping your kit secure and safe

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Your bivvy bag, your hammock, the kitchen sink… There are no limits to what the beefy Big Papa can carry for you when you’re exploring the most rugged and remote corners of the world (within reason).

At 17 litres, Big Papa is our largest seat pack providing secure, spacious and hardwearing beneath-the-saddle storage.

Constructed from waterproof fabrics and made in our UK factory, Big Papa is made to meet the demands of adventure. It’s also available to your spec as a custom product.

Simple to fit and secure once mounted, Big Papa is at its most stable when attached to the Exo-Rail which reduces sway and increases stability. Attachment is quick, simple and secure with a slide-on, slide-off sleeve; 2 velcro seat post straps, and a stabilising saddle rail strap. If you don’t have an Exo-Rail, you can attach the Big Papa using just the saddle rail and seat post straps.

Roll-top closure and compression straps keep the load compact; external bungee cord is ideal for stashing your waterproofs and flip flops.

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.


Key Features

  • Hardwearing, high capacity storage for rugged world exploration
  • Made to last in the UK
  • Fully customisable (contact
  • Made with waterproof and highly abrasion-resistant fabrics
  • Roll-top closure and compression straps for stability
  • Simple 3-point attachment system
  • Heavy-duty seat post straps with aluminium buckles
  • Bar-tacked saddle rail strap, angled for support
  • Reinforced contact points for durability
  • External bungee cord for stashing gear
  • Tapered cut doesn't interfere with your pedalling
  • Attaches beneath the saddle
  • 25 Year Alpine Bond

Vital stats


Stitched seams Buckles: Duraflex S.J. buckle w/ Camlok; 20 mm aluminium


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: 380 g

Tarmac UltraLight

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 lightweight. Weight: 340 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. 


Max capacity: 17 litres Weight: 368 g Size: 50 x 18 x 18 cm

Fitting guidelines

Minimum clearance from saddle rail to wheel: 22 cm 

Origin: United Kingdom

Care & Environmental Advice

Product Care Information

​Big Papa has a DWR coating which helps it to repel water and dirt. After your two-wheeled epic, wipe down your Big Papa with a damp cloth to remove dirt.


The Details