Ortlieb Seatpost-Bag Small

This product is currently out of stock and unavailable.

Versatile and lightweight: one simple tool free manoeuvre is all it takes to fix or remove the waterproof Seatpost-Bag made of PU coated nylon and Cordura. The integrated mounting allows quick change from bike to bike. The roll closure with elastics ensures safe closing of the bag and allows tight packing. The Seatpost-Bag is available in two sizes, the 1.5 liters version being suitable as additional bag for longer trips, the 4 liters model might even replace a backpack. Both versions will protect the rider from splashes and dirt.


Best. Seatpost. Bag. EVER.

The Ortlieb Seatpost mounted bag is great for people who don’t want or can’t install saddle mounted bags because you can switch the bag between bikes frequently.

The Ortlieb Seatpost Bag medium has the integrated ratchet mount that allows you to quickly install and remove the bag from your bike and A fixing for a rear light or reflector.

Please note that this product is not recommended for carbon fiber seatposts.

The waterproof PU coated nylon and Cordura fabric paired with the roll closure will ensure that your gear stays dry. The Small Ortlieb Seatpost bag can hold just about 1.5L

These bags stick out just enough to help minimize the dreaded rooster tail from dirt and water.


  • Saddle Bag Mounts
    • Manufactured from a fiber-reinforced high-tech, anti-scratch thermoplastic that is extremely strong and durable, and in many tests can be stronger than metal parts.
    • Quick-release system allows for easy attaching or removal of bag with a single click.
    • Compatible with standard saddle rails.
    • Not suitable for carbon fiber posts
      • Not compatible with Brooks B17 type saddle rails because of the wide flair to the rails at the back of the saddle.
  • Specs

  • H x W x D: 14 x 35 x 15 cm / 3.5″ x 4.7″ x 4.3″ in
  • Weight: 209g / 7.4oz
  • Volume Capacity: .8L / 0.2 cu in
  • Weight Capacity: 1360kg / 3lbs
  • Warranty

    All Ortlieb Bags are backed by a 5-year warranty against defects in material and manufacturing.

    Please see our Warranty page for the details of our warranty process.