Container holds approximately two cubic feet of soil. Watering is done by filling bottom of container and the soil wicks up the water. I used Malibu Soil and grew an AutoFlower that had a yield of over 12 ounces and won first place in an auto-flower battle contest .... never had to worry about moisture level, it was perfect entire grow. Worms thrived in the mix as i topped dressed and mulched. Can’t recommend enough.