The real problem is usually not quantity but dry-wet mixing
One extra pair of shoes or one damp jacket is rarely the main issue on its own. The bigger problem starts when wet or dirty items are mixed back in with clean backup clothing and next-day essentials.
In family groups, that confusion multiplies quickly once some people are searching for socks, others need layers, and children still need washing and settling for the night.
A three-bag method is often the cleanest solution
Use one bag for damp clothing, one for dirty shoes, and one small next-day access bag for the clean dry items likely to be used again soon. Once those functions are separated, it becomes obvious what belongs in the room and what can remain in the vehicle.
That is usually faster and calmer than spreading everything across the hotel room floor.
Not every day needs a full repack, but wet and dirty items must be classified the same evening
If an item is only slightly damp and will not be used again soon, it may not need a full washing or major reorganisation. But it still needs a clear decision that evening: dry, wash, isolate or compress into a lower-frequency layer.
The real time loss comes the next morning when the group discovers that something is still wet or the matching spare layer is buried somewhere else.
Only clean, stable items should stay in the car overnight
The things left in the vehicle overnight should be clean, dry and likely to be needed early the next day: light outer layers, tissues, regular medicine or a shawl.
Anything that carries water, mud, grass or odour should be handled in the room first.