Unlike those disposable hand warming packets, this $35 Zippo hand warmer will keep your hands toasty for six hours, then can be charged with the included USB cord, and reused over and over again. Plus, you can use it year ‘round to charge your phone, as it doubles as a 5200 mAh USB battery pack. Today’s price is the lowest it’s ever been, so pick this up before it cools down.