My DS goes to the band room first thing in the morning and drops off his band instrument there - his instrument case has a zipper compartment that contains his band music.
He also has a zipper binder similar to the one blackcat linked that has sections for each subject and holds papers and stationary supplies. The binder also has a laptop compartment in the side that he uses to hold workbooks, free reading books etc. He carries the binder, his water bottle and his jacket from room to room all day long. He has lost his jacket once or twice, but, it has been returned because of the clear labeling he has on all his items.
