Watertight, crushproof and dustproof. Extremely versatile dividers–change the sizes of each compartment as necessary, with included Velcro. Retractable extension handle . Open-cell core with solid wall design–strong and lightweight. Strong polyurethane wheels with stainless steel bearings. Easy open double throw latches and fold-down handles. Built-in automatic pressure equalization valve . Stainless steel hardware and padlock protectors . Interior: 21 7/8" L x 16 5/8" W x 10 5/8" D. Exterior: 24 7/8 L x 19 11/16" W x 11 7/8" D. Includes dividers made of durable nylon and foam