This idea comes from a fellow YouTuber, Josh Sanders. Using the Costco down blankets, 4 pennies, and some shock cord, you can make yourself an entry-level and low-budget hammock insulation system that won’t take up much room in your pack and weighs 2lbs. This system is perfect for anyone considering trying an underquilt without paying the high cost.
Josh Sanders- https://youtu.be/n2JH-O0792g