Flexipak Flexitank is a special, soft and tight tank for transportation bulk non-hazardous cargoes, using the standard 20-foot sea or railway container.Features: Flexitanks rangng in size from 16,000 Liters to 24,000 litres 4 layers Co-Extruded PE inner Liners each 125 microns Woven PP outer cover 2/3 inches ball valve or butterfly valve Optional pressure relieve valve Optional Barrier Film(EVOH) for improved oxygen migration properties All materials food grade certificatesflextank at yeah dot net