After a day at work, blow off some steam by hitting your favorite trail with the Osprey Packs Dyna Solo Hydration Belt. It has an angled slot for an included water bottle, so you stay hydrated when you're out for an hour or two, and the main compartment holds your keys, phone, and a couple gel packs. The stretchy waistbelt won't cause painful pressure points or restrict mobility. Plus, a touchscreen smartphone window lets you see your times and check texts without having to stop and pull your phone out.