What term is used for intermediate bulk containers made from flexible material to hold bulk solids?

The correct term for intermediate bulk containers made from flexible material to hold bulk solids is bulk bags. These containers are specifically designed to be flexible and are typically constructed from woven polypropylene or similar materials. They are designed for the storage and transportation of granulated or powdered materials, allowing for easy handling and efficient packing. Their flexibility allows them to accommodate varying quantities of materials while also being lightweight and space-efficient.

In contrast, drums are rigid containers often used for liquids or solids but do not have the flexibility that bulk bags provide. Carboys are large glass or plastic containers primarily used for storing liquids, not solids. Boxes may refer to a variety of container types but lack the specific design and intended use that bulk bags possess for holding bulk solids. Thus, bulk bags are the most appropriate choice for this description.