Knowing how to make your own hand warmers can keep you from being miserable at camp this winter.
Whether you just want to make your own hand warmers, instead of paying for them, or if you want to keep some spare supplies handy just in case you run out, this video shows you exactly what to do to make simple hand warmers.
The video lays out the necessary materials and how to put them together quickly and effectively.
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These DIY hand warmers look simple enough to me. The science makes sense as well, just make sure you keep it in fairly small quantities or it may get too hot.
If you have the materials around your house you can give it a try for little cost.