What is a Container?
A container is a storage location that is made up of bundled items. Generally, these 'bundled' items will be forced to move with the other items in the bundle because they are packaged in such a way that prevents them from moving independently.
The other very important feature of the container is that your general item entry users that do not have permissions to create new storage locations in the system can indeed create a container storage location (but only within the container folder). These users also have the ability to generate labels to go on the bundle for processing.
The containers option must be enabled in your Organization. Go to Settings > Organization and find the section for
When this option is turned on, it will create a single folder in the root of your Tools > Storage Locations called 'Containers'.