RE: Great bowsling/Blind carrier etc
Thats pretty sweet, lol. The frame pack deal was similar to your use of the bungee cords. Those were just attached to the frame. And the day pack is something that I did after years of trying to find a pack with all the junk I wanted on it. Added compression straps to the bottom (like larger camping/hiking packs) and multiple loops of strap material or cordage to be able to hang stuff on. Nothing too fancy - just take your favorite features of backpacks and start adding them to one you already have to make it work for you.