Welcome, Noonie.

Have to admit I have more packs than needed, or even healthy, so am not an unbiased opinion here. But two packs makes a lot of sense if you take trips of differing duration and in different seasons.

I use a fairly small and light pack for trips up to three nights and a stouter, larger pack for longer trips and when I need to carry a food canister, or a lot of gear for some reason. (For just day-hikes I take a rucksack.)

This approach implies spending more than a single do-all pack, but careful shopping can reduce the financial hit. And do-all packs tend to be heavy, complex and overkill for weekend trips. I've had modular packs with detachable pockets, places to lash excess gear, and the like, and they can be a pretty good middleground, but always seem compromised in some way.

Cheers,