The Pelican 1560 Case has a unique design incorporates a sophisticated pressure valve that allows for equal air pressure inside that case, but prevents water molecules from entering. The latch system allows for quick and easy access to the contents and a when closed maintains a tight seal. The case itself is very durable and is constructed with a very tough Co-polymer Polypropylene. Its internal space is 50.6 x 38 x 22.9 cm. The Pelican 1560 external dimensions are 56.1 x 45.5 x 26.5 cm. The case offers a base depth of 17.8 cm and the lid depth of 5.1 cm. A overall weight of just 7.71 kg (with Foam) makes it the light weight case solution you have been looking for.