Cactus Jack Expandable Backpack OCPC. /Up to 2470-cu. in. capacity 40.48-liter capacity Specifications for Cactus Jack Field Expandable Backpack: Manufacturer: Cactus Jack Size: 19x13 in Gender: Unisex Pack Application: Military Pack Type: Backpack Hydration Compatible: Yes Age Group: Adults Pockets: Yes Pack Loading: Top Application: Military Features of Cactus Jack Field Expandable Backpack Main area expands from 5in to 10in to fit more gear; 2 accessory pockets; Water bottle mesh pocket; 2 electronics pockets on shoulder straps; Removable waist belt; Daisy chain holds rain gear; Up to 2470-cu. in. capacity 40.48-liter capacity; Package Contents: Cactus Jack Field Expandable Backpack Cactus Jack WCJFXBOCPC: Expandable Backpack OCPC