You bet!
There are several different kinds of boxed wines though. Some come with clear plastic bags inside (no good), some come with mylar/aluminized plastic bags but have annoying and hard to remove spigots (no good), but the best I've found are mylar/aluminized plastic bags with a soft brown plastic spigot that's very easy to remove and put back on. It's easy to fill them with chemicals if the bag is laid on its back and the opening is held up somehow. After you fill them with chemicals, pop on the spigot, then squeeze out all the air in the bag. No light and no oxygen make for long lived stock solutions, and if you find the right kind of bag/spigot combo comes with a wine you like, they're fun to empty of their original contents
Murray