Using binder clips is a solid move—I've tried clothespins too, but they pop off in a stiff breeze. For windier setups, a few small stones or even duct tape helps keep the mylar where I want it. Gotta say, they’re also handy for rigging up a quick EM shield around radios if you’re worried about interference. Anyone ever try layering two together for extra warmth, or does it just make things sweatier?