These packs were designed to be used as the patrol pack for the CFP-90 rucksack, but they make great standalone packs. Has a large 15”x15”x4.5” main compartment and a 12”x12”x3.5” outside pocket. Has padded shoulder straps, a back pad, opening on top for a radio antenna or a hydration system hose. These packs are a great bargain, priced well below what you would pay for an import copy- with these you get a quality, durable made in the US A product. They are used, in excellent condition.