Pelican 1490 Laptop Case With Foam (Black) 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. Double safety locking latches with keys Interior Dimensions (inches): 17.75 x 11.37 x 4.12 Case fits computers up to 14 x 10.8 x 2.5 inches