Mountain Hardwear 3D Upgrade Liner
This bag is an excellent choice for hardcore outdoor…
Design: semi mummy
Temperature Rating: 45
Weight: 1 lb 10 oz
Price Paid: don't remember exactly ~$100
This bag is an excellent choice for hardcore outdoor people. I've used mine on Rainer, in snow, in freezing temps where the water has frozen overnight. Put all your clothes on that you are carrying anyway and climb in for a toasty night (just make sure you put dry socks on).
I just wish I would have carried up Mount Sir Donald for my unplanned bivy there....brrrrrrrrr. Lighten up your pack and go further, higher, and faster.
The only time I use a heavier bag is when I'm car camping in below freezing temps. Too bad they don't make these anymore (people are so stupid).
Here's what other sites are saying:
Features: Converts lighter Weight: bag into a warmer bag systemZips onto any mummy bag with #8 YKK coil zipperCan be used alone as a summer bagWeight: 1 lb 10 oz / 737 gTemp Rating: 45 F / 7 CFill Type: SyntheticShape: Mummy Specs:Sizes: REG,LONGFill Weight: 7 oz / 204 gLoft: 3 in / 7.6 cmInside Length: 6 ft 0 in / 1.8 mShoulder Girth: 5 ft 4 in / 1.6 mFoot Girth: 3 ft 6 in / 1.1 mStuff Diameter: 7 in / 17.8 cmStuffed Length: 1 ft 3 in / 38.1 cmInsulation: Polarguard 3DLining Fabric: Polyester TaffetaShell Fabric: Nylon Ripstop
Convert your three-season sleeping bag to a winter or expedition bag with the 3D Upgrade Liner layered inside--adds 20° F of warmth to your bag. Zips onto any mummy bag with #8 YKK® coil zipper. Can also be used alone as a summer bag, comfort rated at 45° F. Extremely durable Polarguard® 3D insulation has a high warmth-to-weight ratio and continues to insulate even if wet. Insulated draft collar seals in heat around shoulders.