The Lancer Tactical Backpack is a large tactical style backpack that features numerous places to attach velcro item, 1 outside zippered compartment and a large inside zippered compartment There are two shoulder straps and a waist strap (optional to use). There are also 4 outside straps with clips that can be used to carry/attach accessories. At the top, there are two holes (covered by velcro covers) that can be used for running a hydration bladder hose. This is a standard size backpack (like used for carrying books), approximately 21" Tall by 16" Wide. This is a very universal pack that is perfect for airsoft or paintball gear.