Winter bag sizing

Maybe but I always size up on girth, but then a 66″ girth is tight on me even sleeping naked.

I would go with the bag that fits you height.

As far as boot liners in the bag go, I put them in a stuff sack and place them outside of my sleeping bag either under the foot box, beside me or near my head.  In 30 years of winter camping I have rarely had to try to stuff my feet into frozen boots.  Even then, they warm up and become flexible in no time.

Another option I do, is when I wake up, I wear down booties and put my warm sleeping bag over my boots to warm them while I make breakfast.

Ideally, I’d like to try out the short and regular, but I haven’t been able to find them locally anywhere.  I’m right at the upper limit of the short bag.  I’m around 5’5″ – 5’6″ and it goes up to 5’6″.  I just called Mountain Hardwear and they recommended sizing up.

You should probably size up, go with the longer length.  The length of bags can vary a bit, some size longer or shorter.  But if you go for the shorter length and end up squiggled down in the bag and compressing it anywhere, that will be a cold spot.  Better to fill excess space with clothes, filter, fuel, etc.