Filter Media Bag Size: 12" W x 4" D

I thought that the bag would be 12 inches long and 4 inches wide. The title says 4" D. D should mean diameter in this case. The bag is really about 2 inches wide. I would say that the 4 inches refers to circumference and not diameter.

Except for the poor dimensions, the bag is good. It has held together and works well for filter media. I just wish that it was bigger.