Tumi has made it easier to have your cocktail on the go with its new smart and stylish cocktail-ready cases and backpacks. The Italian-made Tumi Mixology Set ($4,995) comes equipped with a bottle holder sized to fit the newly designed Ketel One vodka bottle, two martini glasses, a shaker, one-ounce and two-ounce jiggers, and custom stainless-steel utensils including a zester, a bar spoon, and olive picks. The package also includes a redemption card for two complementary bottles of Ketel One. The handy case is …