Prefolds are a great multi use diaper.
They are rectangular in shape but have multiple layers sewn together for maximum absorbency.
These are also perfect for stuffing in all kinds of pockets or other diapering systems that may not be absorbent enough for your heavy wetter.
Rearz are Unbleached Diaper Service Quality Premium Indian Prefold Diapers
These Diaper Service Quality Diapers have 4-6-4 layering.