Here's a couple of good packs that you might want to check out.
I use and Osprey Aether 85 now.
Osprey Aether 85 It's the most comfortable backpack that I own. But it's not a hunting pack.
I've been considering buying a KUIU Ultra 6000 pack
KUIU Ultra 6000 Looks very tempting.
KC
I've been seeing good stuff about the Kuiu Ultra 6000 bag with the Pro Frame & Suspension added. I may go that route for now, just because the price is so agreeable and I could always upgrade next season if I feel the need.
I have guided hunters using Kuiu Ultras and have worn them for a short period of time, and I can tell you that I wouldn't use one for hunting and packing any weight if it was given to me for free. For light use and general backpacking it'd be fine.
My main gripe with MR is the weight and short frame length. But, as Scott said above, they did supposedly improve their new frame.
Your $500 will easily buy you a very solid lightly used Kifaru setup.
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