I understand why you would want to carry a patch kit (you've run out of spare tubes), but I wonder how useful patch kits really are. I've carried them for years, but never had to use them. How easy is it to locate a leak? Especially, if you're by the side of a noisy road.

When I'm at home, I have to submerge the leaking tube in the sink to locate the leak. How do you do it on the open, noisy road with no quiet stream nearby? (I think that I'd run out of saliva before I'd find the leak.)

thanks,

Cliff