I hate slime. It makes it so if you get a flat, you can't patch the tube, and it rarely works on anything but a tiny pinhole. I would rather carry one of those split tubes with me. Another trick is to put two tubes in and leave the innermost tube flat. Then, when you get a hole in the first tube, you air up the second one and ride home. It makes your wheels heavier, but if you're dealing with getting alot of flats, it's worth it.