I read about an advice to get a bicycle tire, cut it into sleeves and feed nylon webbing where it connects to the backplate. This should protect a harness some.
I went to my local walmart, they had a bicycle section. I looked over the spare tire tubing they had, I could not determine what size I need to buy for a 2" diameter when flat...
Any advice?
Don't BUY them. Just go to a bike shop, tell 'em you're a diver and what you want them for, and ask for some mountain bike tubes from their garbage. They will happily supply you with some.