If memory serves it had one tank band and a lower Velcro strap to help with stability. My outlaw has only the strap and I didn’t notice any issue.you didn't find the bottom of the tank cylinder rising up as it emptied? With a single strap (at least on the Aeris version) and no stiff spine, it was really annoying. I couldn't figure out how to address this without really hacking it up. I just sold it instead.