The pictures tell the story here, it's over and under quilt sleep system simplified.
1. GT UL hammock (10 oz. ) http://hangingchairhammock.com/grand...-forest-green/
2. Eureka Eagle Point -15 ( 6 lb. synthetic) http://www.amazon.com/Eureka-Eagle-P.../dp/B0015KD114
How it's done1. Cut approximately an 8" slit in each end of the bag.
2. Make a 2 collars about 12" wide, with a channel for a draw string on one end.
3. Sew a binding around the circumference of both slits of grossgrain.
4. Sew a 24" loop of elastic cord to the grossgrain on the bottom of each end of the bag to pull the bag taunt on the hammock suspension lines
5. Sew the 12" collar to the grossgrain on each end
6. Run the GTUL hammock through the bag
7. Hang the hammock, pull the loop of elastic cord out to prussics on each suspension line to draw tha bag out to it's full length.
Pros:The Eagle Point bag is inexpensive and has a draft collar at the shoulders which is drawn up once in the bag, so it snugs up under the hammock occupant. With the hammock inside the bag, it stays completely lofted, and then some. It sets up quick.
Cons: The Eagle Point bag is NOT backpackable. Too heavy and bulky. I use a sled/pack frame which attaches at my hips for winter though, so there is plenty of room for gear, and weight is not a factor.
For winter excursions, I always use an enclosed tarp system, which on the inside has withstood temperatures below zero maintaing a excellent inside temperature.
The hammock is stretched out very tight in the pictures to allow for accurate idea of how it works, for sleeping it would be quite a bit more slack.
It was not possible to take pictures of this setup with the bag occupied, because it was about 90 degrees when I took the pictures.