does anyone know how companies rate sleeping bags?
are there standards for measurement or ratings, do they have machines or do they just put joe inside the bag and stick him in a freezer till he shivers?
seems like there's mixed standards, like I was reading about the panda bag/hammock I just ordered, it has 3 ratings, comfort, minimum and extreme plus a 5000mm water column rating... which I googled but didn't get much, seems like it's a pressure rating for water proofing, breathability or wind breakage or something... so many factors, i was watching man vs wild and he skinned the fur off some smelly dead deer and then cuddled his water bottle full of warm pee and everything...
so I have 3 questions if anyone knows, one is above
two is how did you come up with this formula?
three is how does water column factor in?