Doable is a moveable feast. But for me 7 pairs of undies, pants I’m wearing on the day I board, one or two extra, tops the same, shoes, thongs. Stuff I can layer is always a plus for questionable weather, so T shirt, Shirt and heavier overshirt (denim is my pick) each can be worn by itself of layered. You can cut back if you want to pend time washing. Can each person manage their own carry on?