The bottom of mine broke and looked exactly like yours. It happened in my pack somehow, also in extreme cold. I mixed up some JB Weld and put it back together. I roughed up the plastic and really globbed in on there thick all the way around the break. I havent used it yet, but I'll bet its stronger now than before it broke.
BTW, I emailed Mojo about it and they offered to fix it for $20 + return shipping. But, by the time I did that I'd have $30+ in it and I only paid $45 for it new.
