Grassroots Living Soil Fabric Beds are made in the USA and designed specifically for living soil gardening. They are fabric pots built to make your soil and plants thrive with their innovative MoistureLock™ technology. Regular pots and beds are made of a breathable non-woven fabric that allows for excellent air pruning and drainage, creating an interesting problem when used with living soils. The soil in fabric containers dries quickly from the bottom and the sides. This is generally great for fertigation and other types of growing. However, it is not ideal for living soil. MoistureLock Technology is a strip of BPA-free waterproof fabric sewn to the inside of the container that provides the following benefits: Directs water down and not out the sides of the pot, which helps avoid messes and dry pockets in the soil Promotes even moisture throughout the soil by preventing it from drying out around the sides of the pot. This allows microbiology to thrive evenly throughout the plant root zone. Uses less water than traditional fabric pots while keeping humidity lower in the room because there is less surface area for water to escape the container. Aeration and air pruning still happens around the strip of breathable fabric towards the bottom of the container. Grassroots Fabric Living Soil Pots are in it for the long haul. These pots feature the following additional benefits and features: Comes with all of the PVC fittings necessary to build out your bed. You purchase your own PVC pipe, cut it to size, and use the included fittings to frame your fabric bed together. Made in the USA right in Northern California with the highest quality materials available. At Happy Hydro, we have not seen a higher quality fabric pot than these. The top seam is triple-sewn, making them incredibly strong. The bottom seam is engineered with marine-bonded thread sewn around the outside to prevent rot. The 4x4 and the 4x8 are slightly smaller to fit in their drainage trays and grow tents. Optional Trellis Fittings:  These fittings allow you to add PVC poles around the garden to put a trellis over and around it. See here for installation instructions! Specifications: Size 4x4 4x8 4x16 Dimensions 46" x 46" x 18" 46" x 94" x 18" 48" x 192" x 18" Actual Gallons 165 337 718 Cubic Feet 22 45 96 Cubic Yards 0.82 1.67 3.56 # of 1.5 cf bags of soil 16 32 64 Additional PVC Needed X X X 1" PVC Pipe (w/o Trellis) 21ft 35ft 64ft 1" PVC Pipe (WITH 4' Trellis) 49ft 82ft 150ft Tools Required: PVC Pipe Cutter/Hacksaw, File/Sandpaper, Mallet/Hammer, Drill X X X