Go to the oxygen supplier and shop. I think you will find that a 300+ cf tank takes only a few more inches of floor space than a smaller tank and it will more than triple your run time over the ones you were asking about but only costs slightly more to fill. Oxygen is definitely one of the dominant costs for me so it is critical to pick an efficient setup. Have someone there teach you how to roll a tank and handle one safely. If they wont do this for you then you should go elsewhere.
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