I made a full length underquilt by cutting up a coleman sleeping bag and adding a house quilt to the inside, It got me to 16 car camping at the Michigan winter hang last year. Just had to suspend it with quarter inch truck bungees as it was to heavy for any lighter shock cord to suspend. All in all the sleeping bag and polyfill quilt i had on hand. I used some flannel i had as scrap for the end channels to cinch it to the hammock. Tied some masons line loops the the corners useing a sheetbend. Stuck the loops on the hooks of the bungee cord.