I think this sounds like a cheap, easy alternative that wouldn't take up much space -- and that I'd be less likely to abuse (unlike jellybeans, frosting tubes, Sweet Tarts or Skittles, which are just too, too tempting for me to keep around.)
I'm a big fan of ziploc baggies for carrying things when traveling. I can easily see carrying six or eight sugar packets in a folded-flat ziploc baggie in my day-pack, or tucking them in a ziploc baggie in my glove compartment, guitar case or bedside nightstand drawer.
Thanks for the idea. ;0)
According to CalorieKing, a sugar packet has 4 gm of carbs and 15 calories, the same as my too-expensive glucose tabs. Neat.