Ortlieb Seat Pack

Ortlieb Seat-Pack – 11L or 16.5L

Big storage without the backpack.

The Ortlieb Seat-Pack is a staple in any bikepacking setup—keeping your gear dry, stable, and tucked in tight behind the saddle. With a lightweight, waterproof design and roll-top closure, this rear bag hauls your essentials (like spare clothes or a sleeping layer) without the need for racks or panniers.

Available in two sizes—4.5–11L or 8–16.5L—you can adjust the volume depending on the length of your trip. The built-in air valve lets you compress bulky items down to size, and the tapered shape doubles as a rear fender for wet or dusty rides.

Best part? The smaller version only needs 6cm of seatpost clearance, making it perfect for compact frames or full-suspension setups.

Why we like it:

• Waterproof, roll-top storage with adjustable capacity

• Compression valve keeps your load compact and tight

• Doubles as a rear fender

• Fits carbon and dropper posts (with care)

• Daisy chain mount for rear lights

• Ultra-light with reinforced wear zones

• Two sizes to suit your ride style and frame size

Specs:

• Small: 4.5L–11L (ideal for small frames/full-sus/dropper posts)

• Large: 8L–16.5L (ideal for longer trips or larger frames)

• Secure velcro mounting system

• Waterproof and lightweight

• Reflective 3M details for night visibility