I have 2 bags that get the most use, the first being my Louis Vuitton Montsouris GM backpack in Mono. It's really great for school trips I take, as it can fit the giant leather folders my choir uses, as well as be a good daypack for a night or 2 night trip for an IJCL convention for our Latin club. The other is my Coach Turnlock Borough in black pebbled leather and gold hardware. It works well for everyday use in school as I put in: 4 slim pouches I use for school supplies (pencils, post it notes, lead refills, etc.) in the 2 outer pockets, my wallet and coach agenda in the middle, and if I undo the snaps I can also fit the notebook and folder I'm using for that class, or I put on the crossbody strap and it becomes super hands free and I only then have to carry my books. This summer I've been mostly using a vintage Coach Station crossbody, or one of those jelly bags that looks like a classic Chanel flap.