I've never had any luck with those chemical handwarmers either. But I have one of these and it works great. Only problem is that you need to boil it to reactivate it. I've used mine about 2 dozen times over the last 15 years and it's still going strong. I generally fire mine up when I wake up shivering at about 2 AM and it sure takes the chill off inside the sleeping bag. <img src="/images/graemlins/smirk.gif" alt="" />