similar as other user wrote: metal, mountability aside bottle carrier, and a hose. i avoid those with just a hole on top, no hose, so you rape the valve with every stroke.

mountability or a seaparate mount is neat feat too. gauge not so much, as i need portable pump to get me out of trouble and not to inflate to exact bar i want for that type of tire. other pumps and gauges will do that job.

topeak mini morph is nice. i currently use different small one just as good, “blueline” maybe. anyway, pump, hose with presta/schradder, and a small separate brass valve adapter later for use on gas station air pump.

flats are a pain depending on tire you’re using. i had more trouble get a tire off in the first place.

stay safe :-)