How to extend temp rating of sleeping bag

[JoshOR]

I’ve tried the double bag and it’s a no go for me. I think it smashes the insulation on the inner bag and ends up being colder. I was better off putting my down bag on top of the second bag.

A down blanket, like a rumpl, used inside the bag, makes thing toasty. Same with wearing puffy, tights, hat etc.. Have fun!

 

[Conrad101st]

All the above works, but for me what works best is to add a down or synth quilt inside the bag to take up any dead air spaces, add a closed cell foam sleeping pad.

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Same - I pull in my poncho liner and wrap it around me.