A 3-foot by 3-foot raised fabric grow bed, typically from Grassroots Fabric Pots, sized to fit inside a 3x3 tent.
Jeremy cautions that a 3x3 fabric bed is not actually 36 inches — like lumber, the nominal size is not the actual measurement. Grassroots sizes it slightly shorter so it fits inside a 3x3 tent.
Discussed in: Ep 006