Stackable for storage. Capacity is based on evenly distributed weight. Includes 2 swivel and 2 ridgid casters. Seamless durable 100% polyethylene bins. Leakproof and easy to clean. Bins are mounted on a 3/4" treated plywood undercarriage. Caster type: 3" Polyolefin. Black polyethylene. Tapered walls. Size: 39"L x 27"W x 30"H.