Before I started training for a half marathon, I was typically a treadmill gal. So when I decided to take my runs outside to Central Park, I needed something to stash my phone, keys, and other necessities. The FlipBelt Classic ($29) fits around the waistband of my pants without adding any extra bulk, and stores my phone and keys so easily and safely, I can barely feel them, nor do I have to worry about them falling out.