The Viagrow 30 gal. Fabric Aeration Grow Bags with Handles are durable enough to last for multiple seasons of gardening while creating an oxygen healthy root system for the plant. Designed to allow roots to breathe, these beds stand up well to heavy harvests and can be used for soil or hydroponic applications both indoors and outdoors. The mini raised beds are made of 100% new polypropylene (PP) and are environmentally friendly. Please note that our mini raised beds are measured in trade gallon. A trade gallon is a term used to denote the sizes of standard plant containers in horticultural Industries. A trade gallon is equal to approximately 0.71 U. S. liquid gallon. This shipment includes 3 aeration plant bags.