I take what fits in a backpack and a rolling carry on and do laundry regardless of the trip length. Normally, our trips are several months. However, the next trip is only a month and mostly in warm weather. For the cruises (2) in the Caribbean we are taking one backpack each and a small toiletries bag and a briefcase. On that same trip (not on the cruise ship) we are visiting TN in the winter so taking a small carry on rolling bag with 4 pants, 4 tops, 1 sweatshirt each and a heavier coat. That bag will stay in the car while we cruise.