An alternative cozy is to make a cylindrical sack for the cook set (pot with everything in it) from envelope Tyvek large enough to line it with bubble pack or reflectorized foam windshield sunguard. Make a disk to cover the top of the cylindrical sack. To use it, just stuff the Zloc in the cylindrical sack, add hot water, put the insulating lid on and close the top of the sack. For the top closure, I use a fold-over secured by hook and loop. This way makes for one less thing to keep up with and it works as well as an envelope.