This is one of those simple "why didn't I think of that" ideas: the Alco-Sachet It's a simple plastic sleeve, sealed at both ends, containing a measured portion (e.g. 25 ml) of liquor. They developed it for the airline industry because it is 65 percent lighter and 60 percent smaller than a plastic mini, when full, and 80 percent lighter and 98 percent smaller than a plastic mini when empty. I can also see applications for any venue where portion control is important. Obviously, it's not something you want to see the barkeep at your neighborhood watering hole using, but it's perfect for any kind of service bar. I'm not exactly sure why they chose 25 ml (a little more than 4/5 oz.), which is a light bar shot by any standard, but two of the little jobbies is equal to an airplane mini. I think I've seen something similar used for coffee creamer.