Formula 707 is designed with greater water holding capacity, less perlite and pumice, and specific ingredients for large container gardening. The bag itself is a 30-gallon grow bag containing just less than 20 gallons of potting mix. Formula 202 is made from coarse peat, coco fiber, compost, perlite, pumice, worm castings, bat guano, fish bone meal, soybean meal, feather meal, kelp meal and much more. To find a hydroponics retailer near you, go to http://www.hydrofarm.com/.