The Mountain Hardwear Ozonic 50 Outdry Backpack is a completely waterproof trekking backpack, designed for the most comfortable fit. When you%u2019re moving fast and trying to keep things light, The Ozonic 50%u2019s fully waterproof body is ready to handle the most heinous conditions with a three-layer OutDry membrane and an ergonomic design for continuous comfort. Wicking air mesh shoulder straps and a vented back panel promote air circulation, and a softly rounded hip belt with an offset buckle allows for a supportive, snug fit. Optimally placed stretch and zipper pockets allow for easy access to the essentials so you can keep on going. Features:Guaranteed watertight OutDry construction main compartment and seam taped top pocket, rain room tested for 24 hours HardWave suspension conforms comfortably to the curve of your back and distributes weight evenly while venting channels prevent overheating Customizable