This is the backpack of one of my 8-year-old summer campers. I'm jealous!
(Please note, it comes with its own matching water bottle!)
ETA: The kids' art projects also often seem to incorporate the Harry Potter world... Like, a volunteer came in and did this wonderful roleplaying/storytelling game with them, where they made 3-D game boards and then moved characters through them to tell a story - and one kid made a game board that included a detailed replica of the cemetery where Lily and James Potter are buried! So sad, but adorable. And another drew a pretty rad picture of Harry and Voldemort battling on broomsticks. Budding fan artists!