I've had a Wiggy's bag for 14 years, very light, very warm. I use them 2-3 times a year and they are still like new. I use them primarily in a 4-6 person tent but also have a bivy sack and ground pad for backpack and oconus. https://www.wiggys.com/
I have a wiggy's and it's a good bag little on the heavy side and great for short trips.