A blog called Source to Sea offers step-by-step guidance for making a pot cozy. A pot cozy saves fuel and creates and alternative to simmering when you’re using, say, a one-burn, one-setting alcohol stove, but I’d take one along even I had the snazziest new Jetboil just to keep my oatmeal warm on cold mornings, when the slightest breeze can turn everything tepid before I’m done eating.

If you’re not feeling industrious and don’t mind sending a few bucks to a boutique retailer, AntiGravity Gear will do the gluing for you and custom-fit one to your pot. Once you have one it’s a snap to reverse engineer it and figure out how to make your own to fit various pots.