The Exhale is an idea that brings an important part of nature back to the indoor garden, CO2. Indoor gardening is a complex business and hobby. To do it right all the needs of a plant must be taken into consideration and more times than not, in an affordable way. The ExHale bag is a patented strain of mycelium that produces an abundance of CO2 without fruiting. This means that when our bag is activated, the mycelium grows, eating the substrate it comes with, giving off heaps of CO2 straight into your garden, and it does all this for 6 months - guaranteed!