The foam is closed cell military grade polyethylene that will last decades to come, and is form fitted to fit the Synology DiskStation DS1819+ along with 10 extra hard drives. The Case has wheels and and an extension handle for easy transportation. It has a strong shell that can handle large weights without compromising strength. The o-ring seal gives it a 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.