The Best Grow Bags are made from fabric. The breathable fabric creates the perfect environment. While plastic grow bags may be used for some things overall the fabric grow bag is the choice option of most professional grow masters. Using fabric bags can actually increase the growth potential of many plants producing a better overall product. With fabric bags you have more control over the soil temperature and can easily flush the root systems of your plants with plenty of water. The versatility of fabric grow bags makes them the ideal system for growing indoors. Often preferred over plastics and and ceramics. When thinking about the best size it’s good to remember the bigger the better; so, grab a seven gallon if you are thinking about only getting a five gallon just to be on the safe side. You want the roots to have room to grow.