Currently I have two standardized containers in use, the TinCan™ of 19x9x9 with 15x5x5 internal volume (375m³) and a tare mass of ~50 tons, and the DoubleChest™ of 53x27x27 with a nominal internal volume of 20k m³ (actual volume is 47x21x21 , 20727m³) at ~1000 tons empty. Note that those are actual cubic meters, not cargo units, as we use custom config values, so multiply that times 100 for default.