When the reviewer mentioned that he was probably referring to one of those fake cans that you stash contraband in that looks like a normal can of something had a screw on bottom.
On another note, Boy Scout Motto 'Be Prepared '. Say you walk into a standard shop and want to up your game. She has had a slow day and might be agreeable, she ask " do you have condom "?. If not guess what , you get notta .