“"I hang two mesh laundry bags on the back of the bathroom door. Bras and undergarments go into one, socks into the other. I toss them in the wash just as they are, and no sorting is required ...

For implementation, you can buy a dedicated hanging hamper like this one for $12, or you could just hang a mesh laundry bag from the door if you don't want to spend any money (though it would be ...