Why isn't my powder filled to the top of the tub?

When our products are being mixed and first filled into the tubs, the powder becomes aerated and extremely fluffy and the tub is filled to the top. After a few days, the powder then settles to the point in which you have received it. If we were to put it into smaller tubs they would be overflowing and we would not be able to fill it with the weight of the product specified on the packaging. Please be assured that your full dose of the product is in there as we sell by weight and not volume.