Duct tape is one of the most useful tools to MacGyver your way out of any situation and can be compactly packed by wrapping it around a plastic card like an old hotel key card.
Shown here in the Pocket Pouch.
I used to do that as well. Now I just buy travel size duct tape:
Mini Roll Duct Tape 2 roll pack - for all your travel size needs
Genius idea, Miking! As for tape colors, Miking and I are in similar industries (I'm in theater) and we use different colors to mark the deck all the time (spike tape). I may have to make a roll of black gaff. More than once it's been called on to fix a detached shoe sole!
Great idea! I've always just carried around a big roll in my truck. I'll have to make a couple of these to add to EDC's in various bags.