I like the Muskeg too, but as per your reasons for the cavern over the reckoning, you bow hunt so will you not be adding additional pockets to the muskeg, strapping a bow to pockets does seem like a great system and will make the pockets inaccessible. Are you planning on putting your bow between the bag and lid and your spotter in the bag? Did you go with the 5000 or 7000?
I went with the Muskeg 7000 for following reasons:
1. I do not use pouches on the side of the bag. So, when carrying a rifle the muskeg has the build in side sleeves for butt of gun or tripods legs. Saving the weight in this area by not using pouches.
2. I will not us pouches on the front when using a bow which is why I went with the 7000. I use pull outs for any organizations i need in the main bag. If I need any additional space or organization I will get the OG lid on top. Also, in cold weather rifle hunt my rifle will be on the side of the bag allowing me to add two large pouches to the front if I need even more room or organization due to more clothes, food and gear in cold weather.
3. The muskeg has 2 bow straps instead of 3. I actually liked this as in my experience you don't need 3 straps for a weapon, so my as well save the weight. bottom bow cam sits in the bottom strap handle and top straps secure bow.
4. The side zipper access is between the side compression straps and the front weapon straps. This means you can access the bag anytime without unbuckling straps and loosing compression for any small items you may need to get to. This actually was a key swing factor for me since I do not use many external pouches and I need to be able to get to my zipper swing out pouches easily.
5. Has a bladder sleeve. Definitely not a big deal but nice if or when your bladder leaks inside your bag.
So, to sum it up this works well for my style since I don't like a lot of pockets. I plan on using a small pouch on the belt, a water bottle holder and a medium or large pouch on the top fold down lid, which give me more than enough organization. My maps, P-cord, ground sheet, and game bags will be put in the front sleeve. Spotter will go on top under the fold down lid. In day mode, the spotter will go in the front sleeve where it will be protected.
It was an extremely tough decision for me between the cavern and the muskeg, but the muskeg got the nod as the cavern had more features than I needed.