Steve_Wwrote a review of Marmot Helium Sleeping Bag: 15 Degree Down on March 21, 2016
Familiarity: I've put it through the wringer
This is my second Marmot Helium bag. the first served me for almost 20 years...in fact, I still use it in the summer. It has lost some loft and warmth from a couple goes through the washing machine.
The new one I have had for a couple seasons and it's just a great spot to be when it gets chilly. I've used it down to about 20 degrees on a October trip to the Sierra. Super compressible and light, but still plenty roomy so I can pull my knees up (i'm 6' even and sleep on my side). I am very careful with this bag: it doesn't stay stuffed any longer than necessary.
Looking forward to many years of service from this bag.