Robin, this is for you. In my previous post I mentioned having brought one suitcase for our two-week trip to New York. It weighed 21 kg (about 45 lbs) and contained everything for the four of us, in addition to our hand luggage (also as light as possible).
I knew I would be staying at my sister’s and brother’s homes. They have washing machines, so pajamas, 3-4 days worth of lightweight clothes, and Shabbat outfits (two each), sufficed. I added bathing suits and swim floats, and a duffel bag for the return trip. I didn’t shlep toothpaste or shampoo, umbrellas or jackets. My daughter and I each took one additional pair of shoes; the younger children took none. In an emergency, we could easily buy something. And I didn’t even end up wearing everything. Two booster seats and a stroller were a royal pain but didn’t count in the weight.
Another reason to pack light is to save room for the return. Besides books for the children and the book club, the seats and the stroller, I’m taking a guitar for my son and an air mattress–we hope to try camping again.