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Sleeping bag temp ratings are a total lie, tested this weekend in Flagstaff
I mean I always kinda knew the ratings were optimistic, but last weekend sealed it for me. I took my 20 degree bag out near Flagstaff when it dipped to 28 and I was freezing my butt off by 2am. Looked it up after and found out most brands test with a thick pad, base layers, and a full stomach, plus they assume you're in a tent. I had a thin pad and only a t-shirt on, so no wonder. The ISO rating system actually uses a mannequin with sensors, not real sleepers, so it's all theoretical. I'm honestly thinking of just adding 15 degrees to whatever the bag says from now on. Has anyone else had a bag fail way above its rating, and what do you do to stay warm without buying a whole new one?
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ivan7742mo ago
Thin pad and no layers, that's on you. Ratings assume basic setup, not foolproof math.
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