I bought a Camp Trails Freighter pack frame over 30 years ago, and it's still getting the job done. They are strong and comfortable, and you can buy a bag to fit it if that's your option. BTW, getting any critter out in a pack in one trip would be a challenge.
When packing, I use the old mountain man method with the use of 2 packs. Load both packs and pack one until tired. Return for the other and overlap your first. With this method, you are getting the job done without "killing" yourself.