Become high speed, low drag.
While I did not buy this from BSS, I have used both items (my pulls were just black) and they are quality. This is similar to what I do with cord on my pack zippers but I'd love to have colour zipper pulls too. The red is good for the pocket that contains your first aid it. Use yellow for whatever you want but I think yellow=pee so I'd use it for my hygene-go potty kit.