Built for personnel on tanks and vehicles with tracks. The MCCEB was developed to transport individual mission-essential equipment outside of a vehicle. The Crewman Packs are considered “mounted” because the only place for soldiers to store their pack while on the tank was on an outside mount designed specifically for storing packs and equipment. Can accommodate approximately 5,000 cubic inches! This bag is a large tri-compartmented, frameless bag for mounted crewmen. Can accommodate several bulky items, even fits the Modular Sleep System (MSS)! Features padded shoulder straps with quick release buckles. Three pockets on outside of bag. (Two small and one large.) Water-resistant nylon material.