Proven to be immensely useful for
* Refilling with same or different liquid - e.g. splitting a heavy full detergent jug into two
* Dry Powdered / Granular Substances - e.g. Oxi cleaner / additive, ice melter salt, etc. - very convenient, less dust, spout and measuring cup handy
* Emergency Supply of Water ( for washing hands, dishes, whatever )
* Supply of Water for RV / Road Trips ( if not purpose-built into the vehicle )
* Weight for lifting, to exercise with
* Scoop ( by cutting out a section from the middle wall )