This Packman Saddle Pack features a saddle rail rack and adjustable side compression straps to increase stability and minimise rattle during rides. The pack includes a roll-top waterproof carrier that helps protect contents and allows for flexible storage capacity. Velcro fasteners provides a straightforward and secure attachment onto the seat post. Material: 420D / 600D high density fabric (water repellent and abrasion resistant) 250D Tarpaulin (IPX5 waterproof) Stainless steel (rack) Size: 48 x 18 x 16 cm / 19 x 7 x 6.5 in Capacity: 8L (waterproof carrier)