Hand warmers are nice sometimes to keep your fingers warm, but did you know they are reusable? The warmer is activated by exposure to air, so if you use one for just a couple of hours, you can wrap it tightly in plastic to seal out air and save it for another day. When opened and exposed to air again, it is reactivated. I have successfully used one three times when I was only out for a couple of hours. These are great to have in your pocket while sitting on a stand.