Tcp,
There's a lot to choose from out there. Unfortunately, unless you live where they're sold, it's hard to tell if what works for me would work for you. The old jansports I mentioned are available even though they are out of production. The only thing most hunters would do after getting them fitted is to put a dab of silicone cement on the belt bolt to prevent it from scratching your rifle stock. That's one piece of hardware that has to be covered by at least tape.
https://backpackinglight.com/forums/topic/74122/Here's a lot of examples of models that have survived forty plus years.
