This back pack design is one of the original styles manufactured. Harness, standard hard-plastic pack with 2" (5.1 cm) nylon webbing assembly, soft tank band, and cam buckle is easy to don and duff. Plastic latch-style quick-release waist buckle is corrosion free and impact resistant for durability and long life. Tank Back Pack is a great item for pool cleaning or working under a boat. Soft tank band & cam buckle assembly is also constructed from 2 (5.1 cm) wide durable nylon webbing that has a box stitched plastic cam buckle with a wire cam for extra strength.