Tanks used to prevent liquids from spilling are of course necessary when hauling things such as milk. However, wouldn’t it be more convenient to shrink this large tank as much as possible when empty after delivering the milk to transport other goods on the return trip? A soft tank folds small when empty thanks to the soft material it is made from. These tanks also limit gasoline consumption and reduce greenhouse gas emissions to be more environmentally friendly because cargo trucks no longer need to travel back and forth without a load. There is no concern of liquids inside leaking with a watertight zipper from YKK. These soft tanks are also very clean because the zippers open fully to allow the interior of the tank to be cleaned.