MANGROVE Alaska Waterproof Hiking Backpack 30L Keep gear organized for day hikes with this lightweight waterproof rucksack Stay dry with the Circul-Lite System, featuring ventilated mesh on the suspension system Load a hydration bladder in the main compartment with a dedicated pocket, keeping it flat to accommodate other gear In addition to the main compartment, load equipment into the top pocket for small gear, side pockets for water bottles or umbrellas, and a bottom pocket for shoes and other similar-sized items Keep gear dry during wet weather with an included rain cover and store it in the dedicated pocket on the pack's underside. This pack measures 8.3 by 13.4 by 20.1 inches (21 by 34 by 51 centimeters).