Sapphire,, a little Texas tip !! Buy lots of toilet paper and alcohol !! And save a few one pound metal coffee cans !! Stuff a roll of the toilet paper in the coffee can,, pour alcohol in till all is absorbed and put lid on !! In an emergency you can take the lid off and light the top for hand warmer !! Burns pretty clean but enclosed spaces need to be ventilated and bottom of can doesn`t get hot ,, just the top ,, Put something over the top to extinguish, we used to cover the plastic lid with foil for that !! We used these hand warmers for deer hunting !!