Flasks are handy for maintaining a buzz between serves. We carry them if we are going to be casino-hopping all night, for example. A flask doesn’t hold enough to get to orbit, but it does contain enough to keep you there for a while.
Usually brandy or whiskey. Good for sippin - though I rarely carry one. A couple times a winter I go snow golfing, and I’ll always have my flask for those events.
QFT! Mind if I steal this for my sig?
Bulleit Bourbon Frontier Whiskey
Or Johnny Walker Red (or preferably Black, but if I can get Black, I can generally get good bourbon.)