Lowepro Pro Roller x300 Aw Airline carry-on compatible MaxFit System, patent-pending interior dividers design provides ease of use and the maximum capacity -- all while offering superior protection Long-wearing, ballistic nylon hardshell exterior offers high-impact protection Vibration-absorbing, urethane-case wheels with ABEC-5 rated bearings provide a smooth glide and long-lasting durability The Reserve Pack unzips from the hardshell case to provide additional versatility as needed