Why are Next Gen litters sold by volume instead of by weight?

Our proprietary manufacturing process makes Next Gen’s litters very lightweight and absorbent while at the same time very BIG on performance!  One 10L bag weighs approximately 6 pounds, and is equivalent in effectiveness to multiple bags of competing litters.   If we packaged Next Gen litter by weight, a 20 pound bag of Next Gen litter would be about 3.3 times the size of our current 10 liter bag.