I've been trying to find ways to reduce the amount of fuel I use for cooking, and I decided to try making a lightweight insulated pot lid that is still strong enough so the pot can serve as a protective hard-sided container in my pack.
This lid was layed up with high temperature (>450F) epoxy using one layer of carbon fiber on the bottom, a 3/4" thick chamber containing 7 grams of aerogel granules in an aluminized Kapton film pouch, and a top layer composed of the same carbon fabric and another layer of kevlar fabric. My wife chose the kevlar for the top, saying that it would help the pot to be more visible when cooking after dark. The top and bottom surfaces have a thin coating of food-grade silicone rubber. I thinned the silicone with hexane, applied it with an airbrush, and cured it overnight. Most epoxies have BPA and MDA, and you can never get the resin/hardener ratio stoichiometrically exact, so I don't trust it for food contact.
The lid weighs 18 grams, which is 2 grams less than the titanium lid that came with my pot (a BPL firelite 950). The domed aerogel chamber should have an R-value of about 7.
The domed insulation chamber protrudes into the pot about 3/4", but it can be flipped over if I need that last bit of capacity in the pot.