A flexitank is a large ' bag ' for the transport of liquid which is built into a 20ft or 40ft box container. Flexi Tanks are used to reduce transport costs for bulk commodities ( both solid and liquid ) . This ranges from large volumes of non-hazardous chemicals to foodstuffs. These flexitanks are applied in 20ft or 40ft containers and are economically more advantageous than , for example, the use of tank containers ( up to 40% , even !).