Get ready for your next bikepacking adventure! As a key item in your bikepacking setup, the ORTLIEB Seat-Pack comes with Velcro straps to enable convenient and secure mounting to your seat stem. Projecting backwards from the seat stem, your Seat-Pack also serves as a rear mudguard. The spacious, waterproof Seat-Pack keeps its contents (e.g. an extra set of clothes) safe and dry. Depending on how long you plan to be away, you can conveniently adjust the volume of your pack from 8 to 16.5 litres by adjusting the roll closures on the sides. An additional valve allows you to quickly and easily compress your soft gear for a more compact fit. Your Seat-Pack also serves as a replacement backpack when you\'re out on a day trip, no matter whether you ride a hybrid bike, a mountain bike, a road bike or an electric mountain bike.Thanks to its elastic drawstrings on the top, this model offers additional space for items you need to be able to access quickly. This model needs only 15 centimetres of space on your seat stem.Specification:Fabric: PS21R,Height: 30cm,Width: 64cm,Depth: 22cm,Volume: 16.5L, 11L,Weight: 430g.