i put a little bit of 'slime' tire sealer before i get a flat and carry a pump and traditional patch kit[for my friends] but i have never used the patch kit since using the tire sealer. they also come in small bottles that fit a small tool bag.

the slime does a great job ...yes it adds a bit of weight on the tire but to me thats negligible about 2~4 teaspoonsful is enough.

i get goathead punctures and air leaks for a while i pump it up with air and it seals the puncture and im back on the road in no time.

also you can't use any type of patch/glue/glueless once you put tire sealer as the sealer will eventually work its way out of the puncture and eventually patches fall off.

so you either decide your going to use sealers or patches.

in my experience couple years since i swithched to slimes and doing commuter/recreational type of riding small wheel bikes/folders.....sealers works the best. For purists/racers the tube glue/patching

i had a kit of glueless patch kit once but the glue dried out before i even ever got to use it so never bought those types again.