Any experienced backpacker can tell you the key to packing well is packing bags to go in bigger bags. There should never be a loose item in a pack, in theory.
Driftwood has produced expertly designed and affordable travel bags.
The medium and large pack organizers have mesh edges so you can see in and one internal side pocket. The medium holds a week's socks and underwear and the large is perfect for severl tshirts and boardshorts. They are made with a slick fabric so they slide in and out of your pack easily.
The mesh cube was designed for other small loose items you may need quick access to, it's all mesh sol items can be identified from the outside.