Will the drawers handle heavy fasteners and metal bits without sagging?

Yes—hard panel construction keeps the drawers rigid under load. They're built for actual workshop weight, not empty storage.

Does this fold completely flat when closed?

The 2-level design folds for easier transport and storage. Check dimensions before committing to a specific truck bed or shelf layout.

Can I stack these boxes or lock them together?

Stacking and locking specs aren't confirmed—test-fit your setup before relying on vertical stacking for long-term storage.