An empty big bag.
An empty big bag which can hold a tonne of sand, gravel or chips. Bought on its own as an empty bag.
Blocks
A much bigger block with a cavity/hole going through the center.
Gravel
Clause 804
The bigger thicker blocks up from the 4"
Concrete block that weighs one tonne.
Quarry Products
2" clean medium sized stone
Bags
Small empty heavy duty sand bag.
Aggregate mix
Plastering sand
Regular 4" block with a 30 degree offset.
Chips
3/8" Chips. Very small stones