we are using the M bags.  We have about 8-10 sets of 4 bags, each containg
~4 ounces.  This takes up about 1/3 to 1/2 of a shelf in the deep freeze.
The bags conform to the shape/volume of liquid and are easily stackable. We
also freeze in ice cube trays and pop the milk cubes into ziplock bags
(doubled).  These also conform abit and can be stacked easily.

Has anyone tried freezing in glass jars wider at the top than the bottom
and removing it to plastic double bags for longer storage?  might make the
glass preferers more happy.

-laurawoo