All Peli cases are made from a high impact structural copolymer resin & use O ring sealing technology to make them watertight, airtight, & unbreakable. There's an automatic pressure purge valve to cope with the problem of significant changes in atmospheric pressure, i.e. being unable to open the lid because of the pressure difference. All hinges use stainless steel rods. Interior Dimensions: 9.25" x 7.12" x 4.12" (23.5 x 18.1 x 10.5 cm) Exterior Dimensions: 10.62" x 9.68" x 4.87" (27 x 24.6 x 12.4 cm) Weight: 2.87 lbs. (1.3 kg)