User Review: Sierra Designs Lite 'n Up
Fill: Thinsulate Lit Loft
Temperature Rating: 23 F
Weight: 3 lbs. 4 oz.
Price Paid: $160
This is a very comfortable, warm, light weight and compressible 3-season synthetic bag. I have used it for quite some time, and it hasn't let me down. I wouldn't try to take to too cold of conditions, though.