An empty small bag.
An empty small bag which can be filled with 4 stone weight of sand, gravel or chips. Bought on its own as an empty bag.
Blocks
Gravel
Aggregate mix
A much bigger block with a cavity/hole going through the center.
Regular 4" block with a 90 degree offset.
Bags
An empty big bag.
Small empty heavy duty sand bag.
Quarry Products
4" clean large stone
Plastering sand
Drainage stone-small smooth rounded stone
Concrete block that weighs one tonne.