In Undercover Wine packaging, you have the familiar milk bottle and a label that clearly suggests dairy contents. It would be quite a shock to then open it up and discover red wine inside.
This playful scheme benefited Romania's Ampro Design in a pair of ways: it ensured that the items would be memorable and it enabled the company to give them as client gifts with a notably casual mask, more likely to be received even by those who generally don't accept presents. The jar of milk certainly looks unassuming.
For the maximum success of this disguise, the containers were coated in an opaque white finish and capped with little screw-on lids. Undercover Wine packaging features the word "Milk" prominently on its minimalist face, and the small cow-shaped symbol of grapes suggests the pinot noir inside.