I have 2 OG's, a Schmedium, and a Pint Size, and more Wiebad Fortune Cookies in 4 different sizes. The OG's are bigger than I want for anything, and I personally don't really get along as well with the Schmedium as I do with the Pint Size or the MFC's (similar size to the Pint Size, smaller than Schmedium), but a lot of guys use Schmediums as their 90% solution bag for PRS matches. I shot a year with a Schmedium, 2 years with a Pint Size, and I think now 4 years with Mini Fortune Cookies as my 90% solution for PRS bags. I carry a Schmedium for big, flat obstacles (5 or 10% of match stages) and I do like carrying 2 bags for certain stages (5 or 10% of match stages).
For backcountry hunting, recognizing I will more likely be shooting from a tripod than a positional bag, I wouldn't want to commit to carrying the bulk, even at low weight, of an OG size. Schmedium would be the largest size I'd pack - and I DO pack a Mini Fortune Cookie.