I have a 3 tray Downs box. Nice set-up as you can ad or remove trays. Changing to 1 or 2 boxes cuts bulk, still allows surprising room, can be worn in addition to my lanyard, & provides a nice little work surface. Lifetime guarantee too. I will admit that since I bought my Pentax WP10 I wear a vest more frequently so I have a pocket for the camera.
Those boxes are nice. I like mine better than 2 William Joseph chest packs I had.
Mike