the uboot package, which features a small bottle inside a larger bottle, lets consumers create a mixed drink&mdashspecifically, a uboat cocktail&mdashby simply opening the package. although the design incorporates two bottles, the package has only one closure a screw cap. when the consumer unscrews the cap, the inner bottle is released from its perch at the top of the package and drops down into the larger bottle. the larger bottle holds 140 milliliters of soft drink, and the smaller one holds 30 milliliters of spirits.   
