The two-piece construction of this saddle pack for globetrotting bikepackers is made up of a lightweight, waterproof dry bag with a buckle closure roll-top and air-release valve, and a harness with a bungee cord and gear loops on the top, and a reinforced base which makes loading and unloading quick and easy during short rest breaks, because the dry bag can be detached while the harness stays on the bike. The two buckle straps and two hook & loop straps adjust to a variety of frame sizes and tube diameters, including carbon bikes. Features : Reflective details 2-piece construction: saddle harness and dry bag two buckle straps for mounting to the seat post two buckle straps for mounting to the seat rails bungee cord and gear loops on the top of the saddle harness reinforced bottom roll-top dry bag attaches to the saddle harness at the sides and middle using buckle straps air-release valve for pack compression Waterproof IPX4 PFAS free Waterproof Materials : 220D PA PLAIN TPU 600D PES TPU Our tried and tested, tear and abrasion resistant polyester fabric is 100% waterproof thanks to its PU coating, and extremely robust. Traditionally derived from tarpaulin material, it is ideal for duffel bags, backpack bottoms such as our Waldfuchs 14 or other areas that endure extreme mechanical stress. Specifications : Weight : 580 g Volume : 16 liters Dimensions : 20 / 55 / 23 (H / W / D)