My best advice is that I would really reconsider checking your pack. Instead, I would encourage you to pack your boots in it (or wear them), optics, rain gear, and a set of camo in it and use that as your carry-on so your trip won't be ruined due to a lost bag. In a worst case scenario, you can borrow a rifle. Boots and binos are tougher to borrow.
When I go on a hunt like that (where the airline isn't going to be able to easily get a bag lost for 2 days directly to me), I bring two checked bags and put a bow, some arrows, and ~ half my hunting gear in each so that if one is lost, I can still hunt.
That strategy will also save you on excess baggage fees. One thing to consider is to pack the expensive/fragile stuff in the top lid, so you can pull that off and use that as your carry-on in the off chance you need to gate check your pack.
