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Most listings show milk bottle vases made of glass or metal; several specifically note galvanized iron as a material option.
Some listings mark water permeability as “Untested” or “Unrated,” while at least one listing explicitly states the vase is “Watertight.”
Several glass novelty milk bottles list a 12 oz capacity; other listings do not specify a fluid capacity.
Listed weights include 0.35 pounds and 0.4 pounds; one listing shows a weight value of "-2 pounds" in its details.