I also just ordered some lightweight breathable nylon to make some game bags. They will be much lighter, stronger, way more packable and will not leach blood.
Have you tried making a day pack or similar, Pete?
You have skills man!
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My 5900 packs down close to nothing, so it works as a day pack. It is a very well thought out system. While the whole system with the frame is considerably heavier than a lightweight osprey, it's ability to carry things comfortably trumps weight. Even when we just go for a day hike, I'm carrying binos, tripod, water, some food, first aid, trekking poles, and sometimes even my scope.
Fun fact... the pack has molle loops on the inside as well. I attached a link to the pack. Hard to believe it scrunches down to nothing, but it does.