Outer bag replacement
It's not difficult at all. When you purchase a new outer bag on eBay, it most likely will come with the new strap. You simply have to cut the old one to remove the old bag, fit the new bag on and tighten it down with the new plastic strap. I just replaced the outer cloth bag on my Sentria, as the one it came with was water stained. This also gave me an opportunity to wash the mini-emtor and fill tube assembly. It's a damn shame how a vacuum so new could see such abuse....