Moondog55 wrote:But does it matter that much?
It doesn't matter that much except that some tapes are kind of heavy. Part of the logic behind a pot cozy is fuel conservation. You can keep the food cooking without running the stove. But if the pot cozy weighs more than the fuel you would otherwise burn to maintain a low simmer then it's kind of silly. It would be simpler to just use the stove. And the added benefit is that the fuel is gone and weighs nothing after you've burned it whereas the pot cozy weighs the same on the hike in and hike out.
If I were going to make a pot cozy I'd avoid duct tape. Even the lightest weight versions are on the heavy side. Minimal use of some sort of tape just to hold it together would be my approach. But I long ago determined that for my cooking style it's better to simply run the stove on a low simmer.
All that said, my tape preference is for the Hello Kitty duct tape. You have to pay a premium because Sanrio licenses the image but it's so, so worth it.