ARMYCAMO 40L Outdoor Expandable Tactical Backpack Military Sport Camping Hiking Trekking Bag Size: 14.5" x 21" x 8"; Capacity: 40~48 liters, up to 2470 cubic inches; Weight: 3.6 lbs. Material: 600 Denier Polyester. Main area expands from 5" to 10" to fit more gear; Organizer pockets; Heavy duty handle;Water bottle mesh pocket; 2 electronics pockets on shoulder straps;Removable waist belt;Top pocket for collecting earphone or other small accessories; Daisy chain holds rain gear, etc. Expandable Tactical Backpack is constructed by high quality 600 Denier material, heavy duty over-sized zippers and tabs. Expandable main compartment with multiple gear pouches and molle compatibility that allows customizing the pack for your needs. Hydration compartment accepts up to 3 liter bladder ( not included). Main compartment is 19"x13" and expands from 5" to 10" to accommodate extra vital assault gear to complete your mission. Hydration bladder compatible (bladder not included). There is a mountaineering hook. Whether it's a long hike, an overnight trip, or a weekend getaway,the Expandable Backpack will fit your needs. This backpack is designed to support all your outdoor adventure and hiking needs. It features and extra-large expendable main compartment to fit everything you need for a day hike, overnight or three trip.