Built to airline size and weight requirements; Waterproof bottom compartment for wet or dirty items; Heavy-duty rail along the bottom and reinforcements with abrasion-resistant material on corners for travel toughness; Low-Profile frame system reduces height for easy storage; Replaceable frame components and wheels; Multi-purpose changing pad with anti-slip bottom; Quick-access front zippered pockets; Sturdy, comfort grab handles for easy lifting and maneuvering; Add-a-Bag strap to easily attach secondary bags to roller; Perfect for scuba diving regualtors and smaller gear