So let me understand the complaints. Mylar, and the BB is not made up of the standard formulae of Mylar, has a shelf life.And it's fragile and noisy. So what we have here is a unit that could use a date of manufacture and isn't noisy. God forbid we are kept awake during a blizzard by crinkly Mylar. I much prefer the soothing sound of howling winds to lull me into dreamtime instead of blowing on my whistle. And instead of a compact unit that can be packed in numbers and safety secured on rescue units or carried in multiples by search and rescue personel we want full on bivy bags and sleeping bags. O.K. I understand now.