I won't carry the weight of a Bowmaster on a backpack hunt. I do carry allen wrenchs for every size on the bow (not a whole set), dental floss, leatherman tool and a bit of SnoSeal (works for bowstring wax and boot touch up). Doubt I could get a string or cable changed in the field with the amount of preload on a Prime Rival. I'd try, but would head for the truck if I had too.
This bit me once in 2014 when I got my bowstring into the rocks when I slipped in some talus. Had to pack out, and a few weeks later the Mathews limb started to delaminate where it was dented by a rock as well. A spare bow is a good thing, but I won't backpack it...just take reasonable care. Good luck!