This is an item of stationery (paper or writing goods), or other small merchandise such as good-luck charms, mascot straps, et cetera.
This soft-fabric bag has a drawstring top and can be worn over the shoulders backpack-style thanks to the cords running from the drawstring to the bottom. And the sweet graphic of Yuki Nagato from "The Disappearance of Haruhi Suzumiya" will make it something you'll want to take with you everywhere you go! Measures a roomy 36cm by 44cm.