Attack on Titan Eren Messenger Bag

What sorts of things will you put in your Attack on Titan Eren Messenger Bag? The sky is the limit! You could put manga in there, or yo-yos. You could put your lunch in there, or maybe some Blu-rays. You could even fill it with marbles. It has Eren Yeager on the side of it, so no matter what you put inside, you'll be looking like a cool guy.