Light Weight Hybrid Construction- A hybrid construction provides a frame that is more durable and lighter than conventional metal frame construction Durable Material- Made of water and tear resistant micro-ballistic nylon Automotive Style Quiet Wheel System- Rolling pieces are equipped with and automotive style quiet wheel system. The high impact wheel housings are mounted at the outside comers of the case to ensure superior stability Expansion- Vertical cases are expandable for up to 30% capacity Comfort Grip- Ergonomic rubber handles offer comfortable use when carrying Self Repairing Zippers- Self repairing nylon zippers are standard and complete with chrome stylized zipper pullers Pocket Storage- The vertical cases also include mesh pockets and a removable shoe pouch Wrinkle Free Security- Features interior elastic tie down straps to keep items secure and reduce wrinkling during transit Exterior Convenience- Large external pockets added for packing convenience Lining- Full lining protects contents Modular Function- Low profile AttachMate Strap on vertical case for added carrying convenience Handle System- Each rolling piece comes complete with our lock up/lock down handle system. Simply push the centrally located button to lock the handle in to the up or down position. Once in the locked down position, the handle stores in low profile mode