These are such a simple little setup that can really save your butt, so don't skimp on these. Think it over, bring the tools you need to make working on your bike easier: special wrenches, spare fuses, spark plugs, J-B Weld, the list goes on. The best tire-repair kits include an assortment of tire plugs, patches, and some type of inflator. This can be a small portable 12-volt pump, a CO2 pump, or a hand pump, for that matter. But without air, you just have a flat tire with a plug in it. I've seen CO2 take a half-dozen bottles to fill a tire, so while they can be great, I prefer a pump of some type.