Bags
An empty small bag.
Blocks
Regular 4" block with a 30 degree offset.
The bigger thicker blocks up from the 4"
Chips
Regular 4" block with a 90 degree offset.
Gravel
Screenings-Very dusty gravel
A much bigger block with a cavity/hole going through the center.
Quarry Products
A tonne bag of sand.
Concrete block that weighs one tonne.
Clause 804