The Osprey UL Stuff lightweight and compact backpack is a great bag to have around town, on a trip or as a summit pack. This uncomplicated and comfortable bag is wildly popular for its lightweight and simplicity, as well as for its durability. This bag stuffs into its own pocket so you can leave it in the bottom of your duffel bag to be always prepared for a spontaneous hike or shopping excursion. Weighing just a few ounces, this tiny pack boasts heavyweight features.