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I'm not sure if there's such a thing as a "freelance bartender," but if there was I'd assume they need something like the Meehan Utility bag.

For the alcohol enthusiast, the Meehan Utility bag is a large stylish carrier designed specifically for bartenders. The boxy leather satchel has numerous compartments that will hold glass, shakers, and other utensils one may need when mixing a tasty drink. The Meehan Utlity bag is available at a hefty price of $740.