I have spent some great nights in Gelert tents and used many accessories, so I thought that this bag would be just the thing, but sadly it isn't. Both zip toggles broke on its first outing - sure the bag was full, but not that full, they just snapped off making opening and closing in sub zero temperatures very difficult.
Secondly, the pvc started cracking with the first week of use, revealing the webbing behind. Again, I was not being overly rough - it was as I said, cold, but I expected a bag like this to cope.
So my advice, seeing the positive reviews, is that this might be ok for a weekend canoe trip, and it is certainly nice and cheap, and its size is just right, but I have sadly returned mine.
Absolutely do not buy it for winter sports use.