I recently discovered the convenience of bottling in 1 and 2L soda bottles. It's great to be able to put some kegged beer into a soda bottle and bring it to a party (or wherever it is that I am going and want homebrew). You would need to buy a carbonator cap like this:
I lucked out and was able to get one from my LHBS instead. But it's great. Just fill the soda bottle straight from your tap. Then squeeze out the air / foam, twist the cap on, and connect it to your CO2 line. Pressurize it to 20 psi, or whatever you're aiming for, give it a good shake, and pop it in the fridge. Good to go.
I wouldn't want to use this for storing beer more than a week (usually I drink the bottled stuff within a day or two), but if it's a short vacation, that might be an easy way to bring some of your stock with you.