Formula 707 was created for a special kind of gardener, one who wants to control their own destiny. Formula 707 is different from other potting mixes created by Aurora Innovations. It is designed for greater water holding capacity, it contains less perlite and fertilizer. A custom formula for large container gardening. In fact, the bag itself is a 30 gallon grow bag containing just less than 20 gallons / 3cu ft. of the finest quality potting mix. Just poke holes in the bottom, cut off the top and plant.