Soo umm that can't be good...

[Slowkrawl]

I already geared up a little bit. I think if I wrap them up in a thin blanket of sorts they should be fine in -20. My other pack that didn't puff was still warm through the case 10 minutes after it happened, so hard to say how warm it was while outside.

-20 really isn't that much fun to drive in, but it's what I get to deal with for the next 3-4 months lol.