ExHale CO2 ExHale 365-Self Activated CO2 BagProduct Details The ExHale 365 is a self activated version of the Original CO2 Bag. The 365 will provide a 4x4 foot or 128 cubic foot space with CO2 for 9 months of which 6 months are peak production. With 3 months of shelf life and 9 months of CO2, that makes a year. That's the ExHale 365! The ExHale 365 comes with separation seal that doubles as a hanger after activation. Steady supply of CO2 for 6 months guaranteed Maintenance free No heat No