Do you have any info on the sizing of this pack?

The sizing chart for MHW packs is as follows.

Torso Length
small - less than 17in
med - 17-19.5in
large is over 19.5in

To find the right size pack, use the torso length measurement system. To find your torso length, measure your back along the spine from the the top point of your hipbones to the knobby bone at the base of your neck. This will give you a measurement in inches that will determine the correct pack size. I would use the aforementioned procedure & find your correct size.
View Details: Mountain Hardwear South Col Backpack - 4200-5000cu in >