A bulk bag includes a shell and a gate valve assembly and is configured to retain a material. The gate valve assembly includes a gate which is slidable to selectively prevent and facilitate variation of rate of dispensation of material from the bulk bag and, more particularly, through an aperture defined by the shell of the bulk bag. The gate valve assembly has a configuration which, during movement of the gate to restrict dispensation of material through the aperture in the shell, renders the gate unlikely to snag with other portions of the bulk bag such as, for example, portions of the shell which define the aperture. Methods are also provided.