This is Haydite. A well known bonsai soil additive. We were fortunate to obtain a small quantity for resale. We have bagged it up in one gallon sizes. It weighs 6# a gallon. Unfortunately we received it wet. So will have to ship it that way. but you can see from the picture that it is a gallon, just like bags of out regular bonsai soil. A professional bonsai mix ingredient.