Hey, Zen
That's a thought -- I could try it on one of the little paks first. I think the package instructions say don't cut open. The Contents: Iron powder, salt, activated charcoal and vermiculite. But I might try it anyway and see what happens!
I have used the ones that are sold for use on your back (ThermaRest, think that's the name/brand). I used them when bike riding in the Rocky Mountains (bike tours: Ride The Rockies and Bicycle Tour of Colorado) in the very early morning hours when it is really cold. Going down the descents really fast the air rushing up over my shoulders trigger the muscles across my back/upper shoulder - and I get this really tight muscle that stings like crazy. But by putting one of those heat thingies on my skin up there across the back, just below my neck -- it stops that muscle from tighting up in the cold air.



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