Constructed of 1000 Denier Cordura with the addition of (2) large .6 cubic ft. pockets for a total of 1.2 cubic ft. Just as the name signifies, this is the ultimate in bunker bags. With the (2) extra pockets, it allows seperation of work gear from dress clothes, duty belt or just about anything the firefighter would need to store. You can't go wrong with this 4.97 cubic ft. titanic. Shoulder strap included.