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): 20.37 x 15.43 x 9.00 Watertight, crushproof and dust proof construction Retractable extension handle Wheels with stainless steel bearings Double throw latch system O-ring seal