This, of course. While I am no dummy, it always helps to study and what better thing to help with the studying of the proper use than knowing how to properly fill it up? Study study study, they say!
I need a place to set my drink, and I can't lie. That wouldn't be nice.
If I have one of these, then nobody has an excuse to not come over because they all have places to hang.
For this one, we're magical, yes? So of course we need to float.... or at least appear to. Having things within reach is always helpful, and not having to remember to release the spell is even better. Can't leave something magicked up all day, can we? So let's use a little muggle magic, sleight of hand in a way.
Sidestep! Why not have a little humor? Or disguise? It's still a trunk, after all.... Also good for blowing raspberries at people.
Bonus: Well, I need something to hold it on, right? Right? Howe can I be expected to glide about the halls without grabbing like crazy? I've tried before, it's annoying.

Mischief managed!

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