To even place recovered refrigerant into a tank or vehicle to move it, the tank MUST be D.O.T. (deprartment of transpertation) approved in the USA. And have a non-expired hydo test date. Be carfull buying used tanks,they may be expired.
Never fill a tank more than 80% full. Back to basics: keep in mind refrigerants have different volumes per pound as compared to water.
30 lb DOT recovery cylinders w/Y valve are around $50 to $60 dollars wholesale.
A lot of early recovery machines used tanks with floats (@ higher tank cost/approx + $30 dollars) The trend has been to do away with the more expensive floats and just weigh the tanks.
That brings me to a observation. I never seen a refrigerant scale pictured being used on XS. I'm sure some guys have/use them...........



I forgot "you must" 
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