I'm looking for milk bottles and need help deciding between PET, white plastic, and disposable glass. Any have pros/cons or suggestions on which to get?

I need various sizes from 16 oz - gallon and would prefer a snap screw hat. 
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Hi there my company supplies HDPE and Glass Milk Bottles and we recommend these for farm-to -table restaurants, collectives, eco-conscious vendors. usually the price range for the milk is 25-50% higher than economy HDPE and the profit margin needs to be higher to account for higher transportation cost. 

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For milk storage and distribution, it's best to choose white HDPE bottles over glass or PET.

Glass is no longer widely used for milk, and is not recommended, as UV exposure through the glass can negatively alter the flavor and freshness of the milk.  However, if you are keen on using glass, it is still a reasonable option if the milk is expected to be stored for only a short time prior to use.

PET bottles are widely used for soft drinks, beer, and other liquid products, but not commonly for milk.  PET bottles are not as versatile as HDPE for the storage of dairy, since they the milk may require additional chemical treatment, or the bottle may require custom changes, to make sure that the milk does not spoil or take on any odd flavors.

HDPE bottles -- multiskin, lightweight, and single skin -- are the most widely used for milk storage and distribution.  White HDPE plastic provides an effective light barrier, and the bottle can be used to store pasteurized milk, sterilized milk, and chemically-treated milk (UHT, among others).

We therefore recommend white HDPE plastic bottles.
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HDPE superiority is a bit overblown. Both PET and HDPE when using the proper opaque colorant(commonly white), will provide similar protection. As for oxygen ingress, the OTR(oxygen transmission rate) of PET is less, keeping more potential taste and vitamin damaging oxygen from permeating the bottle. PET allows 3.5 as compared to 150 for HDPE - (Permeability is in cc/mil/100in2 in 24hrs)