This used German Military Surplus Metal Gas Mask Container originally held gas masks for German troops. Of course, you can use it to house your gas mask, too. Don't have a gas mask? Repurpose these handy and practical canisters to hold whatever contents you care to stash inside. Each metal container includes a locking lid and a special locking compartment inside the lid to place smaller items to keep them organized and prevent them from swimming to the bottom.