OK,
So you are a professional pilot, how do you think you should appear/smell.
Clean under/tshirt, underwear and socks for each day. White pilot shirt
good for 2 days. Uniform pants good for trip. Shaving kit. Casual/running
shoes. One outfit for going out to dinner/movie/etc. One workout/running outfit that can be rinsed out in hotel tub.
22 inch roller bag does the job plus bag for headset/EFB/misc. in cockpit.