What are Flexitanks? Flexitanks are a packaging system that converts a standard 20' Shipping container into a bulk liquid carrying vessel for your information more and more companies are changing from Drums / IBC's and ISO tanks to the more cost effective Flexitank solution. All M. Y Flexitanks are made using the finest materials sourced from around the world to construct the finest multilayer Flexitank on the market. M. Y Flexitanks have built up a very good reputation over the years and we have many satisfied customers located worldwide.