Green full 21 cf tank is 600 liters. Comes with everything shown. Light and portable. The advantage of this bottle is you can get it refilled for cheap at any welding supply without needing a prescription. If you only need the full tank I can sell that for $90. If you need this for welding, I have regulators for that also.
Second pic is an aluminum cylinder with built in regulator, also full for $50.