Hi guys, this is a L FlipBelt, used only once. You wear it around your waist and it has a bunch of interior compartments to hold things while you run, etc (see photo). You're supposed to flip it so that the openings are toward your body once your stuff is in it. I use my flipbelt when I ride rollercoasters to avoid paying for a locker - it holds my phone, car key and credit cards perfectly. I wear it under my shirt and spin it so my phone is between my back and the coaster seat. I've lost a bunch of weight so this one doesn't fit any more, but I immediately repurchased in my new size because it works so well. Let me know if you have any questions! Flip belt