Features of the Gregory Quadro Hardcase Roller 30 Travel Pack Proprietary quadro spherical wheel system sets the standard in multi-directional rolling Ultra-durable handle and wheel housing components covered by gregory's Lifetime guarantee Reinforced polycarbonate construction delivers outstanding impact strength, superior stability, excellent thermal resistance, and low-temperature toughness Hardshell construction protects gear from weather and impact damage Lightweight High-strength retractable locking handle with TPR coated comfort grip Activeshield compartment expands from zero to fifty percent of the overall bag capacity to provide vapor, dirt and odor resistant protection and separation of active and casual wear Interior mesh pockets for storage and organization of small Items Zippered compression panels and Dual compression straps to keep gear and clothes neatly packed while traveling Expandable zipper provides additional 15% of capacity on 22in. carry-on size and 20% on 30in. check-in size Custom comfort grip molded zipper pulls Lockable zipper sliders for peace of mind when you find yourself a little too far off the beaten path