LLM, with the Sky Train I pack m clothes in an Eagle Creek folder and put that whole thing in one side of the Sky Train. I can then put a small briefcase with a computer in it on the other side if I want to put everything in one bag. Obviously if Im not carrying a full briefcase the items from it I carry will go in that side of the Sky Train. That way I can put the whole thing on my back with the backpack straps or carry it over shoulder depending on weight and my mood, how far to walk etc. It is sometimes nice to have everything in one bag. On RJs, I can pull out the briefcase and put the Sky Train in the overhead and the briefcase under the seat. On real planes, and MD80s, the Sky Train with the briefcase in it will fit in the overhead. It is really a quite flexible system.