+1 on the Montbell bags.... the stretch is fantastic, especially if your a big guy who likes to turn/move ..... and they're light. (watch out for wet down).
I have an older UL SS Downhugger #1 (Long.... I'm 6'1 and 230#) and use it with a thermarest NeoAir Xtherm pad.... Been down to the single digit temps in a tent and didn't get cold.
The stretch was the main reason I bought it... and I have no regrets. I woudn't say the montbells are the most durable bags, but I've always had a tipi or waterproof bivvy to sleep in, so mine has held up.
I would love to try a quilt sometime, just to see.
Cheers,
A
