The reason I feel weights and hammock type are important, is that this bag will be slung under the hammock and gravity will want to pull it down and sag in the middle ... this would be worse with a bridge hammock, which we don't have here. Sagging in that middle area leaves room for cold to get in and chill that whole butt area if it isn't supported properly.
Regardless of which suspension you choose, it's important to realize you need to beef it up considerably from what you will read about quilt suspensions. You have a 4+ pound bag and most quilts of that loft run around ~1.5 pounds, using 850 down. So the suspension cords will need to be beefed up a bit to carry that load and give the capacity to snug it up properly, consider going up just 1 size to get a bit more pull.
The traditional suspension will require channels on all four sides, each fitted with shock cord of a suitable size, likely 1/8" in this case. You will need to get enough tension in the side suspension to lift the bag sufficient to keep it snug against you when you get in the bag with no gaps.
The Clew suspension is my favourite and there are quite a few flavours posted on this site ... I prefer light and simple so I just add a strip of 1/2" grosgrain with a few 1/4" loops sewn on like this
IMG_3022.jpg
Make up the clew with small shock cord using 1/2" split rings (cheap and light)
IMG_3028.jpg
Finally sew that strip on the end of the quilt and attach via those slit rings
IMG_3104.jpg
An alternate to the corded clew that may be better suited for you is a spandex version of the Clew, posted here
https://www.hammockforums.net/forum/...or-Underquilts
Hopefully some food for thought
Brian
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