What's wrong with crates anyway? I mean, granted, not too many people still use wooden crates, but it might be reasonable to have cardboard boxes with logos on them or space-age metal crates or even shrink-wrapped pallets. Guns might be in gun cabinets or safes.
As for barrels... In real life we write things like "FLAMMABLE!" in giant letters with flame logos on stuff that might blow up. Most of these FPS take place in the near-to-distant future, so why not just copy reality for this?
As for barrels... In real life we write things like "FLAMMABLE!" in giant letters with flame logos on stuff that might blow up. Most of these FPS take place in the near-to-distant future, so why not just copy reality for this?