Didn’t smoke in HS. But film canisters in college served quite a few extracurricular purposes … 

 What @HODLr said. Film canisters were perfect. Nobody would dare open them because it might expose the film.

Also, a spare eyeglass case worked too. 

 Legend 💪🏽
sunglasses case 
forgot about that one 

 film canister classic like other people giving it to you that way
inside cig pack ~> normal/convenient
mostly just in clear ziplock bags cos whatever

or the clear wrapping around cig packs used as a bag sealed with bic lighter melting