Also would suggest some of the diaper bags/multifunctioning totes that are still at the outlets *see my avatar*. The heritage stripe one is nice b/c of the canvas cover, and they also have the signature stripe ones. It's got both handles and shoulder strap and can fit a fair amount inside of it (plus the interior pockets are handy for storing lipgloss, waterbottle, other little odds and ends).
I wouldn't necessarily recommend poppy if you've gotta carry a LOT of stuff--they're good for a couple of books, but it's hard to zip the bag up if it's overstuffed. I use my tartan poppys when I need to carry maybe one notebook and a few smaller books, but not a lot of binders and such.