Yes, I carry a few grams of detergent powder in a zip lock bag. I wash in clean dry bag to avoid dirty sinks. And I air dry my clothes over night!

It is simpler and faster than dealing with hotel laundry, laundromat or carrying extra 10kg of clothes around!

You just wear your dirty clothes in the shower. No worry about shrinking or stretching either. They will even air dry while you're wearing them if carrying a second set of clothes is not an option.

The big problem with traveling without any bags at all is that you get flagged by security for extra attention. Turns out terrorists are too cheap to buy a set of luggage and a return ticket if they're just going to blow themselves up.