Finally got Bears pack done and we have taken it for a test walk. He doesn't seem to mind having it on once he realizes that we are going for a walk. Wasn't to much of a pain to construct even with the hand sewing.
We used a extra large dog harness and a set of Coleman ATV bags (19 bucks at Walmart).
Place the bag on table with bag openings to the table, then lay the harness in the postion that it would sit on the dog (this is the hard part making sure that nothing is tangled) The coleman bag has a circle hole in the center and this lines up perfectly with the dog's leash hitch on the harness. Pin into place and then tack with a hand sewing, making sure to use strong thread as this will see alot of wear and tear. I went over some places with the sewing machine just to give it added strength.
And there you have a dog bug out bag or a dog walk backpack for less than 20 bucks (if you already have the harness.
Will try to get pictures this weekend of it on the dog.