Quote Originally Posted by killerweed420
Most of the cheap ones you can buy like at walmart you have to squeeze hard to make the 2 components mix and produce heat.
I gotcha, I just found some like that online. I'll pick some up tonight man. thanks for getting back to me with the info. I don't mind wearingt he bag everyday, but I was looking for a hideable heating element, just in case the body heat didn't work out.