Polyguard Vault. Non-biodegradable polystyrene. Interior Dimensions: 14"L x 11"W x 9"H; Inside Narrow: 10.25"L x 7.25"W x 11"H See Diagram Exterior Dimensions: 20"L x 17"W x 11.5""H. Weight: 11 lbs. Closure: Adhesive coupled with tongue-in-groove fitting.