Mini booze bottles on a plane: The travel hack to end all travel hacks. That's right you rowdy devils. As long as they are under 3 oz. and stored inside a clear plastic bag, you can bring mini booze bottles in your carry-on bag—as many as you’d like. Just order up your complimentary mixer of choice, and voila! It's a $2 cocktail instead of an $8 one. Rum and coke, gin and tonic, and Stoli and OJ are all reliable combos, though you also can’t go wrong with a bourbon on the rocks.