Hermione’s eyes rose straight to her hairline when Harry started to pull a notebook, a biro, a water bottle, and a small volume out of several compartments of his new bookbag. Noticing her look, the teenager chuckled, "The elves noticed that my bag was falling apart. So, they gave me this for Christmas. It's huge and seems to have a hundred compartments. I can carry the invisibility cloak, the box for messaging Tom and all of my schoolbooks simultaneously. There is even a compartment at the bottom, where I can put in a change of clothes. It's also lightweight and has something like a notice-me-not woven into it. Barty fell over it twice already."