A conventional flexitank and an E-Flex are about the same size and weight. What makes the difference is the bulkhead. The weight of the bulkheads is even more than the flexitank itself. The manufacturing process, positioning to loading location and transportation within the loaded container produces a lot of additional carbon footprint. The bulkheads also create a problem with recycling or disposal which is nonexistent with E-Flex.
Most of the multinational companies have environmental targets as part of their social awareness. Carbon footprint is an important aspect for them. The fact that E-Flex has 40% less carbon footprint compared to conventional flexitanks has been a point of preference for them.