Originally Posted By: Art_in_FL

That might be a bit bulky for smaller kits where size and weight are at a premium. Smaller kits can sometimes benefit from inclusion of some surveyor's flagging tape:
http://en.wikipedia.org/wiki/Flagging_(tape)

It comes in a wide variety of colors and widths from 1" to 6". The most common rolls are 1" wide and better than 500' long wound on a cardboard core is about the size of a hockey puck. Shorter lengths can be wound up without the core and can give you a hundred feet or more in a compact and light bundle.

Not a bad idea, but to be truly effective at being a signal to others, it's got to be bigger. A 1-inch x 10-foot banner is essentially useless at any appreciable distance.

I read once that the human eye can detect about 1-inch difference in color at 100 yards.

So, if you have surveryor's tape in the 1" size, i'd suggest some sort of method for making it of a larger size - be it tape, weaving, or melting pieces together.