The waterproof Ortlieb Seat-Pack QR bag is suitable for any cycling adventure, whether it involves trails, mountain routes, or gravel paths. Thanks to the innovative and patented Seat-Lock mounting system, the bag is extremely stable and can be installed and removed in just a few seconds without leaving marks on the bike. This model is compatible with adjustable saddles (dropper posts) via a special adapter with a width of only 4.3 cm. The durable, abrasion-resistant nylon material and internal reinforcement ensure stability even on rough terrain. Five compression straps allow secure and tight packing, while the valve with strap enables additional volume compression. An elastic band on the outside offers the possibility to attach extra equipment. At the bottom of the bag, there is a special protective plate that prevents contact with the tire and also functions as a mudguard.