Transport Infrastructure (Dangerous Goods By Rail) Regulation 2018

A bulk container is a system for containing solid substances, including any liner or coating, that—

is designed for transporting solid substances which are in direct contact with the system; and

is of a permanent character suitable for repeated use; and

is designed to facilitate the transport of solid substances by 1 or more modes of transport, without the need for the substances to be unloaded and reloaded when transferred from one mode to another; and

is fitted with devices that permit ready handling; and

has a capacity of not less than 1m^³.Examples of bulk containers—

freight containers, offshore bulk containers, skips, bulk bins, swap bodies, trough-shaped containers, roller containers, load compartments of vehicles and flexible containers

However, an IBC, large packaging or a portable tank is not a bulk container.