A really good question.  Here is what we do in our popup with the 4 of us.
We bought these stackable drawers about a foot and a half dimensionally on
each side.  Each family member gets to fill up one for the trip.  When
towing they are packed on the camper floor and when camped they make a stack
on one of the lower countertops (and make for a raised 'countertop' at their
top where stuff like a mirror and such can sit).  For the dirty laundry as
it amasses we just fill up plastic bags which move into the car out of the
way.  This seems to work well for us in keeping the clean clothes all nice
and out of the way and the used clothes 'gone'.  It also helps in keeping
the folks from bringing their entire wardrobe with them.

A little tangential thought, but I write it because I am thinking of it as
it has to do with keeping the camper 'cleaner'....  For the floor we use a
few long and skinny rugs that fit right in, bought in Linens and Things or
Bed Bath and Beyond or someplace like that.  We trimmed one of them to fit
around a corner.  After the trip they go into the washer too.  Works well
for us.
Tomes

Better idea...do what my parents did when my brother & I got old enough -
the tents were for us to sleep and live out of.  They had some more room,
and we enjoyed being out in the tents.  It was a lot more comfortable for
all of us not to be crammed in the pop-up together.

Wesley