my personal preference is to always have something too warm than too cold - perfect example - I did an AT trip in April, forecast showed mid-high 50s, with altitude we would have been near high 40s. My trail partner brought a 40* bag and I had a 20* bag. Temps hit mid30s and he froze every night, with long underware - I was in shorts only and couldn't have told you it even got cold (till I woke up ready to get out of the rack).
'tis better to vent than freeze!
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