@mcb - You’ll be well served by either a pint size or Schmedium. Or even a full size or OG. Heavy fill and Waxed Canvas are the only things on which I can say I wouldn’t compromise, but you could give me any of those 6 models and sizes and I’d be able to shoot the same score.
@Walkalong mentioned using a small, flat bag, and I do think it’s probably worth considering - probably worth carrying the weight. I simply have not found the bag I like for the job yet. I think I prefer an L shaped bag over a true flat bag (like the Milk Toast, X Wing, or Beaver Tail bags). Wiebad was talking about a bag last fall, but have yet to release it, and Phantom Precision Tactical makes/made what they called a V2 barricade bag - but I haven’t bought it yet (kinda waiting on the Wiebad version). Some portholes - or other obstacles like the stairs
@Walkalong mentioned - are just too small for a typical barricade bag. I practice shooting with my barricade stop and no bag just in case, but a nice flat, heavy fill, waxy or sticky/grippy L shaped bag I can wedge against the lip of a porthole would be nice to have.
If weight and bulk were not a concern, AND if MD’s weren’t so commonly restricting to one bag per stage, I would probably carry 3-4 bags for PRS. A barricade bag, an L shaped small porthole bag, a body-filling support bag, and a small prone/bench rear support squeeze bag. So a Pint Sized Game Changer, an L shaped V2 Barricade bag, a Pump Pillow, and a Cube. I’ve not ran into anything which those 4 bags couldn’t handle at a PRS match yet. BUT!!! I very, very seldom run into anything the Game Changer cannot handle alone, which is why it’s the only one which I carry/use.