"one-nighter" is the key point here. Now you're going from carrying little stuff and supplemental protection from rain or cold to shelter, some kind of padding, and possibly insulation(season depending), plus the duration may point to needing more water, even a way to boil it for cooking if you don't want a cold camp.
How much stuff are you wanting to put in there?
I can cram a lot more into an Osprey Manta 25 than the reviews of it would suggest is even possible-everything for a very comfortable summer overnight here in the South, but it certainly wouldn't be close to my ideal choice for that. I'd much rather have a 32-38L pack for winter dayhikes and summer overnights, and 40-45L in winter when carrying more insulation(bigger down bag and/or jacket).
The Manta series leaves little to be desired for dayhiking, though.