A box is more convenient than a bottle
Portability is key! Boxed wine is easy to store (it’s geometric, so you can just Tetris it into picnic baskets, book collections, even spare-tire wells), transport, and share with your friends. “3-liter boxes... are easy to pack and take on an outdoor adventure or can be enjoyed simply as your go-to everyday house wine,” says Moore.
Bar fights involving boxed wine are virtually nonexistent
A dude coming at you with a glass bludgeon? Scary. A dude coming at you with some soggy cardboard? Sounds like the aftermath of a particularly competitive breakdance competition. And not that scary.