The foam is closed cell military grade polyethylene that will last decades to come, and is form fitted to fit the G-SPEED Shuttle XL along with 2 extra hard drives. It does not fit the smaller sized (4 port) G-SPEED Shuttle. It has wheels and and an extension handle for easy transportation. The strong shell can handle large weights without compromising strength. The o-ring seal gives the case its waterproof characteristic. A Purge valve allows air to enter the case, but not water which makes opening it in high altitudes easy. Padlockable holes reinforced with stainless steel are setup for padlocks to keep the contents secure.