The 20 lb. Package B Power Tank is our best selling package with the biggest Power Tank we offer. With double the CO2 of a 10 lb. Power Tank, a 20 lb. Power Tank is built with high pressure tow rig and trailer tires in mind. It has a large capacity at the expense of limited portability making it a little more cumbersome than a smaller Power Tank if you need to remove it from the bracket it and walk it down the trail. It is best left in the tow rig or trailer at base camp where you can drive your UTV up for quick tire air ups and utilize the maximized CO2 capacity to air up multiple high-pressure/high-volume tires after driving on the sand. The Package B includes accessories not found in the Package A that will make using your Power Tank faster and more convenient.