hand warmers (heat packs) in checked luggage?
By hand warmers or heat packs, I mean the small plastic packages that when opened warm up to about 120F (50 degrees C) for a few hours. They're usually packaged for camping, although they're also made as heat packs for pain relief.
Are they allowed in checked luggage?
I'm soon flying to the mountains where it'll be cold, and I usually like to carry hand warmers with me in those temperatures. I'd prefer to bring hand warmers along, rather than have to stop and shop in my destination. My preliminary searches on TSA and the web haven't found anything- the TSA doesn't mention them at all.