Reference for Avodah Zarah 119:4

אמר רב פפא האי עובד כוכבים דדרי זיקא וקאזיל ישראל אחוריה מליא שרי דלא מקרקש חסירא אסיר דלמא מקרקש כובא מליא אסיר דלמא נגע חסירא שרי דלא נגע

R. Papa said: If a non-Jew carries a skin-bottle [of wine] and a Jew follows behind him, if it is full it is permitted because [the wine] does not shake, but if it is not full it is prohibited because there is the possibility of shaking. A full cask [being carried in such a manner], is prohibited because he might have touched it, but if it is not full it is permitted because he did not touch it.

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