Large crates: Dollar Tree plastic storage containers

Small crate: Megablocks with Lego grate piece.

No matter where you are in the universe people need somewhere to store their stuff. And if they travel they need smaller spaces to store their traveling stuff in. So storage containers are universal.
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I saw these little clear plastic bins with colored lids and immediately saw weapons crates and storage crates. The design really makes them futuristic. They go well with the variety of crates I've painted up.