Natural CO2 Grow Bags for your Indoor Garden, Grow Tent, or Greenhouse Most advanced CO2 Bag in the market, engineered to guarantee maximum yield. 8 to 12 weeks of organically generated CO2. Free discreet shipping. Cultivated mycelium strain that is highly productive, non-fruiting, and non-spore producing. The perfect addition for your greenhouse, grow room, indoor garden, or hydroponic setup. Increase your yields today, with our natural CO2 bag!