went up in the attic today looking for my good (ski) gloves due to recent weather and some upcoming backpacking trips plus one to Kansas for a pheasant hunt.I haven't been skiing in 8 years or so but there in the plastic containers where we keep some of that stuff I found a plastic bag full of old hand and foot warmers. Since I have an 2 night trip this week, I had been thinking of getting some anyways. However, I decided to test these as the package had no notice of an expiration date...opened up a pair (original package was intact) and these things barely produced any heat at all and only for a short period.
I keep a couple pairs in my truck's emergency kit..they are probably 2-3 years old. I wonder if they are worthless as well. Does anyone know how long these things last? Thanks.