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 Interior Dimensions (inches): 30.01 x 25.02 x 16.01 Watertight crushproof and dust proof Open cell core with solid wall design - strong light weight Pressure equalization valve Large 2-person fold down handles Retractable extension handle