Pelican cases are kept watertight through the use of a tongue and groove fit and a polymer o-ring. Pelican cases come standard with an Automatic Pressure Equalization Valve which releases built up air pressure while keeping water out. Pelican's Pick N'Pluck foam lets you customize the interior. Stainless steel reinforced padlock protectors Exterior Dimensions (L x W x D) - 30.75 x 20.5 x 11.62" (78.1 x 52 x 29.5 cm) Interior Dimensions (L x W x D) - 28.5 x 17.37 x 10.5" (72.4 x 44.1 x 26.7 cm) Retractable extension handle 4 strong polyurethane wheels with stainless steel bearings Watertight, crush-proof and dust-proof Easy open double throw latches Open cell core with solid wall design - strong, light weight