The new PP injection molded PCi Foam Case with CART is engineered as a hard side rolling wheeled US airline carry-on luggage case that easily rolls down the aisle of an airplane to fit under many seats and/or in overhead compartments. The PCi Foam interior has a sheet of convoluted foam in the lid held by an elastic cross over strap and 4 contoured layers of medium density gray open cell foam in the bottom of the case. The PCi Foam case combines the best features of the original Porter Case patents, with years of customer feedback and requested enhancements to give you a revolutionarilly easy travel experience. The PCi cases offer a new TSA combination lock which allows you to lock your case and safely check it, when needed (if TSA needs inside, they have a pass key). We added single button controls to the extension handle system and embedded it below the top surface, a water/dust resistant gasket, spring loaded side and end carrying handles, a new extension handle lock for the CART position, tough PP construction, 4-inch ball bearing wheels and more.