I have always been thinking to buy one, but like you never got round to it.How about a sleeping bag liner? (Silk?) I was thinking about one myself as I have a very old (and average) sleeping bag, and I sleep cold anyway. But no experience of them.

I ended up with a long sleeve cycling shirt, winter fleece top and another fleece inside the bag! Next time I'll simply bring the thicker bag seeming as I have one. I'm an idiot.
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