I wasn’t able to copy a picture of what I have used into this post, so unfortunate. My wife sewed a nice WSU cover case for my D and E tanks and I used a sport SCUBA tank back-pack. Yes, an Under Water Self Contained Breathing Apparatus sport back pack. I use to SCUBA dive in my younger years, that’s where I came up with the idea. Looks a bit funny but I gave up on looking politically correct a long time ago . It is comfortable and easy to change the tanks when I need to. A standard day hiking back pack worked well too. Don’t by cheap you’ll regret it later.