Current Carry: Skookum Dog Citizen Canine, Founder's Briefcase, Synapse 19 (day hikes), Guide's Pack (longer day hikes), Yeoman Duffel (winter/emergency stuff for the car), Aeronaut 30 (travel), Night Flight Travel Duffel (camera bag), Moveable Feast + Shop Bags (food)
I am also able to fit a big plastic bag with night outfit which usually consists of 3 layers. which I think could fit in the size 4 Travel Stuff Sack.
For laundry and other heavy duty but lightweight hauling, a size 5 which would match the size of the original Large Pouches (the size of a letter size notepad) would be another size I would suggest.
Darcy, the pictures of the filled and labeled Travel Stuff Sacks placed in the Aeronaut are pure genius!