R.I. Gen. Laws § 47-15-12: Designation to be minimum without tolerance below.

The quantity of the contents may be stated in terms of minimum weight, minimum measure, or minimum count, but in those cases, the actual quantity shall in no instance exceed the stated minimum by more than ten percent (10%), and there shall be no tolerance below the stated minimum, except that the limitation on the actual quantity in excess of stated minimums shall not apply to peat moss, leaf mold, compost, animal manure, mulching materials, or similar materials or mixtures thereof, and for those materials the director may, by regulations, establish reasonable permissible maximums.