http://www.amazon.com/TETON-Sports-S.../dp/B00R5WR644

$19 and weigs 12oz. We have a couple of them. I like it since my bag is a very thin 42deg bag which is only possible if I am fully dressed in winter gear and sleeping in it at 42deg. Point being, it is another layer, albeit a thin one. Its great to use in hot weather too, just use that instead of the bag if I get too hot during the night.

We have a few Coleman fleece insert/bags too and those are bulkier and weigh probably 1.5pounds. They for sure make the bag warmer, but they trap moisture too. These can be used as a standalone sleeping bag when its warmer.


I bring the Teton liner with since I think it helps if the temp is going to be around 50deg or lower and above 70.