If your on a road bike DO NOT USE SLIME! Slime is totally worthless in sealing of flats once the air pressure exceeds 60 to 65PSI; then as the stuff is spitting out you get green slime all over the inside of your rim. If flats are a concern you could get a kevlar tire that weighs on the average of 300 grams plus you could add a Mr Tuffy or a Slime liner that weighs 90 grms then you have to use a thicker tube (120grms) because the liners can wear through those thin racing tubes, then after all of that still have problems with sidewall penetrations. If you want the best flat protection currently available then go with the Specialize Turbo Armadillo. This tire weighs 360 grms but you can use the Specialize ultralight 65grm tube, so your total weight will actually be less than the liner route.

I carry an assortment of flat repair stuff with me because I commute and ride in remote areas where a walk would be very long, so I carry 6 glueless patches (I aways attempt to fix the tube first) a spare tube in it's box, a spare ultralight folding tire (in case a main tire gets destroyed), and a boot patch (if a main is patchable).