1. Field of the Invention
This invention relates to bulk storage containers and in particular relates to bulk storage containers for carrying loads in the range of one half to two tons and known as flexible intermediate bulk containers (FIBC's).

2. Description of Related Art
Flexible intermediate bulk storage containers are increasingly employed in cargo handling and transporting situations, especially for the carriage of particulate or pulverulent material. A typical bulk storage containers will be manufactured from a fabric woven from a polyolefin tape and have integral lifting loops. Examples of such bulk storage containers are described in UK patent numbers 1591091 and 2063816. Bulk storage containers have to meet various national and international safety standards; for example, it is normal to require a five to one safety ratio, that is an bulk storage containers rated at one ton should not break under loads of less than five tons.

A recent trend in the FIBC field has been the increasing usage of FIBC's having a much squarer configuration for powdered, flaked or granular materials which do not form a stable package when filled into an FIBC. Examples include products with a low specific gravity. Other products tend to pack more firmly in a square cross-section. The square configuration also improves the packing of filled bulk storage containers's in, for example, ISO bulk storage containers, as well as improving stacking.