Made of durable and shock-resistant polycarbonate shell; features quiet wheels for superior mobility, and three carry handles on the top, side and bottom Each suitcase can be stacked on top of each other with the interlocking grooves of the luggage shells; allows for convenient storage at home or in a car Equipped with the DELSEY patented SECURITECH Zip that is 3 times more resistant than a standard zipper; features durable and quiet wheels for superior mobility, and four carry handles on the top, side, top and bottom Integrated TSA-accepted combination lock enables you to secure your luggage using your own 3-digit code Expandable interior features removable washable lining with two full packing compartments: tie-downstraps, a zipped pocket, and lined divider with two mesh pockets