This is a game we play at Boy Scout Summer Camp.
The object of the game is to guess what you can take through the Green Glass Door. I will give you clues periodically in my posts, but i can't post a new clue until someone posts so i don't get infracted for double posting.

For anyone who already knows the secret. DO NOT GIVE AWAY THE ANSWER,
But you can help me with the clues.

Ok,

You can bring pizza through the Green Glass Door, but you cannot bring the sauce.

You can't bring bread through the Green Glass Door, but you can bring Jelly.

You may bring books through the Green Glass door, but you can't bring words.

You can bring Harry Potter through the Green Glass door, but you can't bring Hermione or Ron.

Now I will leave you to Guess. Happy Hunting!