So I tested it further by adding some nylon webbing to the compression straps on the back of the stuff sack to form backpack straps. I also added a waist strap to hold the pack to my body.
The result was a pack decent for a quickie overnighter that weighs about 6lb with food and 8oz of water included. Here is a picture:
In real life I would carry a larger water bottle.
Inside the pack is a torso-length of a z-rest pad, a bivy sack, a 20-degree down quilt, toiletries, full roll of TP, jacket for wind and light rain, down sweater, cooking set, fuel, matches, Aqua-mira, a day's worth of food and on the outside is a free-standing bug net. Missing is a poncho to use as a shelter. I don't have one yet. But I think I could replace the whole tarp/bivy/bug net idea with my The One tent anyway. It'll fit, too.
The whole thing works, meaning that I can wear it and my gear fits inside. But it isn't very comfortable. I think if I can find a decent old pack in a thrift store I could put real backpack straps on for a much better fit. As a test, however, it seems promising so far.
As for this post meeting the requirements to be categorized as boring news, the news is that today is my birthday. I'm 44 now. Half my life may already be over.