Light weight and strong. Features double snap lock down and an automatic two-way relief valve to take out or let in air. Case would need to have the air vacuumed out in order for the seal to pull down watertight. Inserts can be removed. Spring-loaded aluminum handle is extra comfortable since it is wrapped in rubber cushion. Two places by each fastener to put padlock, or security device. The boxes measure 17 1/2′ x 12″ x 6″ outside diameter and 16″ x 9 3/4″ x 5″ inside diameter. Weighs 7 pounds. NOT GUARANTEED TO BE WATERPROOF!!