I just bought a sheet of 1/8" neoprene from W.W. Graingers. They were very reasonable on the price. What I bought was a 1'X2' square. If you used something like that, you would have to glue it to your tank straps. Do a google search for Graingers, or McMaster-Carr. Either one of them should have it, and may have something more suitable for your application.