A flexible bulk container comprises a tubular side wall structure (1 to 4) of woven fabric, lifting means (13) at an upper end of the side wall structure, and a base (14) closing the lower end of the side wall structure. The base is in the form of a polygon having an even number of sides and comprising...http://www.google.es/patents/US4730942?utm_source=gb-gplus-sharePatente US4730942 - Flexible bulk containers
