I have the Topeak Morph for my mountain bike and for my road bike I like to use CO2 cartridges. It is just so much easier for me personally. In my seat bag I carry a spare tube, 2 levers, a patch kit (the glue kind not the sticky kind.... which is garbage), moola, ID, and 2 CO2 cartridges which are on sale right now at EMS (Eastern Mountain Sports) for $4.95 for a set of two.

It is just my personal preference when trying to pump up my road tires to 110 psi in a hurry.

I did learn to deflate your tire with the CO2 in it when you get home and inflate with your floor pump, because the CO2 only lasts about 2-3 days.