The premium Ergon BX3 backpack is the ideal companion for mountain biking. The redesigned, adjustable carrying system of this backpack allows for maximum adjustment to the size of the body, whether petite or stout.the "Adaptive Carrier System" uses the principle of load compression and thanks to the flexible aluminium profile, the backpack adapts perfectly to the rider's anatomy. Ergon backpacks offer not only unique ergonomics, but also a lot of features. Once you try them, you'll love them. Name:BX3 Evo Purpose:MTB Racing, Marathon Size:Uni Volume:15L + 3L Material:Nylon, Polyester Raincoat:included