Material Specification Built with super strong vinyl coated waterproof fabric. Radio Frequency heat welded seams to ensure IPX4 waterproofing standard. Strong Molle construction for additional utility. Features 100% Waterproof bag Effective waterproof roll-top design with quick release buckles for ease of packing. Smartly designed adjustable strap construction to use it as a sling bag. One Molle construction at the front to mount it over the Expedition Trail bag (37L) and additional utility. Reflective branding to ensure high visibility during night rides Best used with Expedition Trail Bag. Capacity: Holds 15 Liters.