Must be mostly brown and corrugated (amazon boxes, appliance boxes, etc.). It has two (or more) distinct layers separated by an air gap.
Cereal boxes, beer cases, and that sort of material is NOT classified as cardboard. It is considered a paper product. Please do NOT include that type of material with your cardboard. We HOPE to start collecting that soon.
Cardboard should be folded and cut so it stacks flat and is less than 4 foot square. It should be stacked neatly on the ground and your other containers should be placed on top of it so it won’t blow around.
The cardboard does not need to be in a container. Please do NOT put your cardboard in a unflattened cardboard box.
It is your responsibility to make sure it doesn’t become a mess that bothers others.