Designed for the lightweight day hike, the CamelBak Cloud Walker 18 85-oz. Hydration Backpack will keep you light on your feet all day long. This lightweight pack holds an advanced, 85-oz. CRUX reservoir system for easy hydration when needed while offering 940 cu. in. of space to bring gear along. Its sustainable, durable construction pairs a 200-denier fabric body and 420-denier bottom with water-repelling DWR treatments to deliver a CamelBak pack you can count on every time. The Cloud Walker 18's Air Support back panel and ventilated mesh shoulder straps provides cooling airflow, while side compression straps and removable waist belt let you customize the way your pack rides. Highly functional backpack also features an exterior zip pocket, 2 side stretch pockets, and a trekking pole attachment complete for total convenience. Lightweight, on-the-go hydration and gear transport 85-oz. CRUX reservoir system 940 cu. in. of storage space 200-denier fabric body and 420-denier bottom Water-repelling DWR treatments Air Support back panel and ventilated mesh shoulder straps Side cargo compression straps Removable waist belt Exterior zip pocket 2 side stretch pockets Trekking pole attachment Specs: 18"H x 10"W x 9"D Weight: 27.87 oz. Capacity: 15.5L Fits 15"-19" torsos Fits 26"-46" waist/hips 60% polyester/40% nylon 4-pocket design