Blocks
Concrete block that weighs one tonne.
Chips
3/8" Chips. Very small stones
Bags
An empty big bag.
A much bigger block with a cavity/hole going through the center.
Quarry Products
Drainage stone-small smooth rounded stone
A tonne bag of sand.
2" clean medium sized stone
Small empty heavy duty sand bag.
Gravel
Aggregate mix
Regular 4" block with a 90 degree offset.