The Ziplocs are an excellent place to start. It has saved us from suntan lotion disasters on more than one occasion.
We bring home cans of Balashi and bottles of Amstel Bright. Fortunately we also have hard sided luggage. We purchase the beer at the grocery store to be able to pack it a bit more carefully than just throwing it in at the airport.
They get wrapped one by one, in a piece of clothing and waded up further in the center of everything inside the suitcases. We are also fortunate to travel with at least two suitcases, sometimes three.