Safe Storage and Transport of SCBA Cylinders. Holds 2 cylinder inserts per bag. Each insert is a 9″ diameter tube (45-60 minute large profile bottle) with a hard plastic bottom and rigid side walls to keep cylinders protected and upright. Each bag has two handles and an over the shoulder strap for ease of transport. Each bag has a silver reflective stripe for low visibility situations. One bag holds a complete Rescue Kit.