This is probably the smallest compressed air bottle made for paintball. The GI Sportz 13 cubic inch 3,000 psi compressed air bottle is about the same size and weight of a small 9oz CO2 bottle (1.1 pounds). This tank will get you 150+ shots depending on your marker. The output pressure is between 800 and 825 psi. This is similar to CO2 pressures. Any marker that uses a CO2 bottle can also use this HPA bottle without modification. A standard gauge will tell how much pressure is remaining. The tank is compliant and meets all DOT, CGA, and ASTM standards. 5 year hydro requirement.