I think you gotta pick one that fits you—they all seem pretty much the same but fit different.
The frame backpacks don’t really have a good place to pack anything heavy. If you’re serious about packing a baby + a hindquarter, I’d recommend going with either a wrap or a “lily baby” type of carrier. Then you could put the baby on the front and regular pack on the back. Our one year old is coming antelope hunting this year and that’s the setup we decided on. One grownup will be shooter and the other will be baby carrier/entertainer/earmuff handler.
I wouldn’t go deep in the mountains and pack an elk with it, but it should be fine for a couple miles without much elevation and a reasonable sized load.