inner or bivvy to boost a sleeping bag warmth

[tigercat]

I am planning a walk thru the overland track in winter using huts with a macpac express 600 bag. Would I do better with a SEA TO SUMMIT Reactor Thermolite Liner (AREACTOR) or terra nova moonlight sleeping bag cover to boost the bag warmth.

[Moondog55]

If you read all the other threads on the liner you would see that most find it of no great benefit warmth-wise, and as I advocate sleeping in your warm clothes obviously I say buy the bivvy.
That bivvy looks like the old Mont-Bell Ultralite bivvy which I found too small for my winter bag ( ME Redline ) so make sure it fits to allow maximum loft before purchasing

[Miyata610]

I have used both the thermolite liner and a goretex bivy, and sometimes both.

They each will contribute to the warmth of a bag. The bivy more so.

[hikingoz]

I am planning a walk thru the overland track in winter using huts with a macpac express 600 bag. Would I do better with a SEA TO SUMMIT Reactor Thermolite Liner (AREACTOR) or terra nova moonlight sleeping bag cover to boost the bag warmth.

I've got both the items you ask about. I always take my TN bivy but never carry the S2S reactor liner because the latter is far too heavy and bulky for what it does. I've got a Western Mountaineering highlight which wieghs a bit over 400g. That's the same as the Reactore "Extreme" but the sleeping bag liner isn't as warm for the wieght.

THe Terra Nova moolight bivy is very small and light but it does a great job of keeping my sleeping bag dry, clean and slightly warmer than usual.

The S2S liners are redundant kit in my opinion. There are better items for boosting temperature.

[nq111]

Different approach? Save the down and get extra warmth http://www.westernmountaineering.com/in ... ntentId=44

[Rob A]

When I get home the bag liner always stinks. I wash it. My bag doesnt stink.
On the warmth front, theres no right or wrong answer, it depends.
If you dont get dressed to go to sleep then a liner will make a differnce, trapping air to the skin a bit differently.
When its hot, or you get a new neoair thermarest, you can sleep in the liner and rip the bag open to use as a quilt.
But $75 for a liner Buy a 'reeely is' silk liner off ebay for ten bucks or sew an old sheet together.
If I was cold I would dress for it, and if that wasnt enough then bivy. Jeez it would have to be cold though.
I would never use a bag without a liner though, and it costs what ... 142 grams.

[Tony]

Another approach Western Mountaineering multi use sleep system, I have used this system for a while now and it very well for me.

Tony

[tigercat]

Thanks for all the ideas I'll forget the liner, get the light bivvy and wear clothes if its really cold!