Rock Prime is made from ultra-strong polypropylene. It's super tough and impact resistant and packed with practical features. Expander zips can be opened to increase the volume of the case, ideal for last-minute extras or holiday shopping. Eight smooth rolling wheels and a telescopic handle help them glide effortlessly along platforms and concourses. For your complete peace of mind, Prime cases are fitted with an integrated Travel Sentry-approved TSA combination lock. Travel Sentry allows your suitcase to be legally opened by aviation security agencies without damaging your case. Design excellence continues inside, where you’ll find a luxurious soft-touch lining, useful zipped pocket, and mesh divider section and elasticated straps to help prevent contents shifting. Leave your packing worries behind with this expandable hardshell with larger sizing allowing extra capacity for all those last minute additions, without having to purchase a larger size or another case.Built To Last- a