This Rock suitcase is made from ultra-strong polypropylene which is tough, durable and impact-resistant. It is built to last, with all Rock products coming with a 15-year manufacturer's warranty against manufacturing defects. The Sunwave suitcase features an expander zip, which can be opened to increase the volume of the case, providing valuable additional packing capacity. It also has 8 smooth-rolling wheels and a telescopic, push-button handle for effortless travel. For peace of mind, it is fitted with an integrated TSA combination lock. The interior boasts a luxurious soft-touch full lining, a mesh divider section, a convenient zipped inside pocket, and elasticated packing straps to keep your clothes securely in place.