Took care of that bow several years ago.;)
The extra batteries are a must. You can also streamline your gear to use the same batteries. Rangefinder, headlamp, and GPS all using AA gives you the opportunity to carry ONE set of extra batteries, plus in a real bind you can rob them from another...
I haver used mine for two years now, and love it! I usually just carry the frame and day pack. You can shave some weight by leaving the duffle behind, and compress your camp between the frame and day pack. Nice to be able to bring out a load of meat that first trip out.
I'll be hunting elk with a partner this year for the first time in a few years. I usually hunt solo, and will be for deer, pronghorn, and goat if I happen to draw.
I will keep a spare release and a multitool in my pack. I will also have a back-up bow and extra arrows in the truck. So far I've only gone to my back-up bow once, and that was more of a confidence thing.