Constructed from extremely durable polypropylene.;The built-in purge valve equalizes pressure so you can open the case after changing elevations.;Pick-and-pull foam insert for impact-absorbing protection;Strong, secure, easy-open latches;IP67 Rated- watertight and dustproof;Exterior (L×W×D) 31.39 x 20.39 x 12.32; Interior (L×W×D) 29” x 18” x 10.75″