This heavy duty case features a double wall construction and is smooth-walled on the inside of the case. The Tank Tube is stronger than roto-molded cases and is able to withstand 7200 lbs. / sq. ft. of pressure. It has a spring loaded steel handle with rubber grip, 1.5" wide strap with side-release buckle, 1/2" foam lining at the top and bottom. Optional wheels are available.