Bags
An empty big bag.
Gravel
Aggregate mix
Blocks
Regular 4" block with a 90 degree offset.
Chips
Quarry Products
4" clean large stone
Small empty heavy duty sand bag.
3/8" Chips. Very small stones
Drainage stone-small smooth rounded stone
A tonne bag of sand.
Clause 804
Concrete block that weighs one tonne.