The object of the game is for players to discover what can be taken through a hypothetical set of green glass doors. Once you know the secret to bringing your items through the doors...please post "hints" such as the ones I'm about to post...same format please
at no time will we reveal the secret itself...just pages of hints lol
here are the hints...and the format...

I’m going through the green glass doors and I’m bringing steel but not iron.

I’m going through the green glass doors and I’m bringing boots, but not sandals.

I’m going through the green glass doors and I’m bringing beer but not wine.

I’m going through the green glass doors, and I’m bringing a kitten, but not a cat.


See if you can guess the secret to what is allowed through the green glass doors...and post more hints to play along)