Phat Sacks provide excellent root zone aeration and drainage. Unlike traditional plastic grow bags or nursery pots, the fabric material of the Phat Sack “breathes,” so your roots have better access to oxygen. This ultimately stimulates better plant growth. The Phat Sacks also provide superior drainage over traditional plastic containers all while not allowing dirt or grow medium to spill. When roots grow through the fabric of the sack, they stop growing. This is called “Air Pruning” and it leads to finer root growth for better water and nutrient absorbtion. Made with environmentally friendly mterials.