What separates theGregory Quadro Pro Hardcase 28in Roller from ordinary suitcases? The Quadro Pro starts with a durable hard polycarbonate shell and a scratch-resistant exterior finish. An ActiveShield removable internal compartment with Polygiene Stays Fresh anti-microbial technology seals dirt, moisture, and odors to keep the rest of your clothes fresh and dry. The Quadro Pro's TSA-approved combination lock incorporates a high-speed USB charger for added convenience. Interior zippered pockets, top and side grab handles, sturdy YKK zippers and a spherical four-wheel system complete the Quadro Pro.