For us, each person gets 1 duffel bag for clothes. Plus we have a plastic bin for weather-related stuff like rainboots, rain jackets, extra sweatshirts, gloves, etc. The bin stays in the tow vehicle out of the way.
Agree with what others said about the shower. It's a great place to stack sleeping bags, duffel bags, etc. The older 17Z's (like my 2010) has a tall shower base, but a few years ago Jayco changed the design to a short base.
2010 Jayco 17Z
2007 Jeep Commander Overland 4x4 HEMI