 Aluminum ferry tanks not only took up valuable cargo space and damaged the aircraft but made the aircraft susceptible to fire due to fume build-up within the tank.In 1991 Turtle-Pac came up with a solution to this problem with the development of a collapsible Ferry Tank.Unlike aluminum tanks, the collapsible tank is made of a soft structure that can alter shape under high “G” loads, which increases its puncture and burn resistance.