On the side a vent can be seen, which may be used to keep the contents cool or filter out dust. On top of the crate are four cleats, most likely to be used while in a Vertibird's storage bay to secure crates while in flight. The hydraulics system would be perfect for maintaining a tight seal, preventing dust and grit from contaminating their delicate plasma weapons and power armor. These containers seem to be airtight, and have internal hydraulic arms to open and close the crate. The Enclave crates appear to be brand new or very close to new in construction, unlike other crates and bins encountered throughout the wasteland.
