There seems to be some confusion of 2 issues in the milk storage container
decision.
When freezing milk, it does not matter whether or not leukocytes stick to the
container, as they are killed by freezing.  What is more important in the
freezer is that the container be air tight to prevent dehydration and
spoilage, and that the milk remains frozen until use.  Plastic disposable
bottle liners are not very air tight, and the milk spoils more quickly in the
freezer.  It may help somewhat to store them together in an airtight plastic
container.
        The nylon lined human milk bags are designed to be less permeable as
well as less sticky, so they theoretically prevent freezer burn and spoilage
and fats and leukocytes do not adhere if the milk is refridgerated.  The
plastic only bags are thicker for better durability, less likely to burst.
        When milk is to be stored at room temp or refridgerated, glass is the
preferred storage container.  Though macrophages initially adhere to the
glass, they let go and come back into the milk as it sits.  Leukocytes of all
classes are able to live for days in refridgerated or room temp milk.  This is
why it is usually better to use fresh or refrigerated milk than frozen.  Also
some babies object to the saponification of fats in frozen milk (they become
soapy, yuk!)
        Catherine Watson GEnna, IBCLC  NYC  [log in to unmask]