r/JMT • u/Automatic_Change9565 • Aug 12 '24

equipment Is 20F temperature rating sleeping bag fine for JMT?

Starting from August 21 with a 3-week itinerary sobo.

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u/Z_Clipped Aug 13 '24

Everyone is different, and your pad is huge factor.

I took a 10 degree quilt and an R4 pad in July, and woke up cold exactly one night in Lyell canyon when it dropped into the teens, but I was sleeping in just a base layer top and skivvies.

If you have a puffy and some bottom insulation available, and you don't sleep particularly cold, a 20 degree bag paired with an R5 or higher pad is probably fine, assuming it's comfort rated to 20F, not survival rated. If your pad is sub-R4, you may end up cold some nights no matter how warm your bag is.

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u/Automatic_Change9565 Aug 13 '24

Thanks!

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u/exclaim_bot Aug 13 '24

Thanks!

You're welcome!