User Review: Marmot Men's Trestles 15
Source: bought it new
VERY warm. Used this bag in the Grand Canyon when temps were in the 10°F range for several nights. Bag was super cozy and I wasn't cold any of those nights.
This bag, for the price, is excellent. It might not be as light as some others, but for $100 you can't beat its warmth and compression.