I also received the Dot & Dot 18" Packing Organizer to try out.
This one is just like the 15" one except it holds more shirts. It also comes with a description on how to properly fold your shirts to get the most space out of your organizer. This is easy to use and fits great in any of our bags. We use a full size suitcase and Danny uses a duffel bag and I can get these in both of them. I really like this and with the mesh it is easy to squeeze it down to pack more things on top of it.