This is an item of stationery (paper or writing goods), or other small merchandise such as good-luck charms, mascot straps, et cetera.
Take the "K-On!" girls with you everywhere you go! They're printed in pink and red on this deep burgundy backpack, made of sturdy woven fabric with a zipper all around, a separate zippered pocket on the outside, and padded shoulder straps for comfort. It's just what you need for school, travel, or just about any situation where you need to take your stuff with you!