Backpacks 28 liters. Back with cool air system (grid with physical separation), to let the air continuously and can transpire better. Set in the chest and waist for extra support backpack. 600D polyester ripstop fabric (ripstop). -Ax. Compression straps. Cubremochila for embedded at the bottom of the backpack rain. Compatible to incorporate water bag camel bag main pocket. Side racks. Dimensions: 30x15x50 Cm. Weight: 1200 grams.