Green’s Dictionary of Slang

1. (US) a liquor store.

1973		G.V. Higgins Digger’s Game (1981) 160: I stopped at a packy and I bought three quarts of Beefeaters.
1997–2001		Online Sl. Dict. 🌐 packie n 1. a liquor store. (‘On your way back from the beach, swing by the packie and get some beer.’).
1997–2000		Da Bomb 🌐 21: Packy: Liquor store; package store. I’m going to the packy. Want anything?

2. (US) a convenience store.

2013

T. Robinson Hard Bounce [ebook] [We] picked up a couple grinders at an all-night packie [ibid.] Junior was kind enough to go get at the packie for her.