Anyone have any experience with the North Face inferno -40 bag? I recently ordered one and it appears well made, but didn't have as much loft as I was expecting. I measured around 9 inches of loft. My rei brand -20 as around 8 inches. The rei bag has a much smaller interior area. I'm a bit concerned that since the north face bag has only slightly more loft, but more dead space inside it will not be any warmer than the bag I already have.
I was thinking of exchanging it for a marmot CWM but thought I'd check to see if anyone has used the inferno bag. It looks like a nice bag but by the time I'll be able to test it out I will be outside the return policy.
The north face -40 in the one on the right in the pic. Not sure if I'm missing anything there but if the north face bag has the same loft and a bigger internal volume I'm not sure how it would end up being any warmer unless I'm missing something here?