Outer Shell

Outer Shell Expedition Seatpack

USD $150+

At a whopping 16L, this is the biggest bag you can fit under your seat without a rack. For a smaller version, check out the Dropper Seatpack.

It is meant for light, large volume items like a sleeping bag, tarp, and clothes. This bag feels solid even loaded up on the bumpy stuff because it has a 360° internal plastic frame that holds its shape. Rugged metal cam buckles means secure, no-slip connection points. Durable, water resistant construction. Good thigh clearance with room to get behind the saddle. This is a no-frills work horse with one strap for compression and extra gear.

*Must have 4.5″ of exposed seatpost and 8″ saddle-to-tire clearance


  • 16L max. volume
  • Specially shaped 360° semi-rigid plastic frame
  • Rubberized contact patches under saddle and around seatpost
  • 6-point webbing attachments
  • Corrosion resistant metal-cam buckles
  • Roll closure with velcro
  • Compression strap can be used to strap on extra gear
  • Minimal seam construction for water resistance and durability (the top and sides are one piece of fabric)
  • PU coated Cordura (water resistant) or X-Pac main fabric (weatherproof)
  • Handmade in California

Product Specs

Weight618 g
Capacity16 L
CountryUnited States