Have a couple I use--smaller for just the basics and a larger one with a bottle pocket in the center.
Generally prefer that to a backpack (sweaty) or mounting luggage to the bike, especially when rotating among bikes, where I can lose track of which tools and tubes are on what one.
For bikes with two bottle cages, one bottle can hold the essential bits and I skip the pack. This becomes less attractive in mid summer.
No harm giving it a try.