You bring up a great point! When we travel, I like to take school pencil box -- plastic, maybe 4"x8"s1.5", give or take some. Snap lid is attached. I take basic tools, but more important, I figure out what I am going to work on, based upon what extra time mom and dad project that we will have. I have taken showbox-size Sterlite containers that hold some paint, parts, adhesives and tools. When it's just to kill a little time, I might take some 1/35 military figures or some 1/24 figures. These require a minimum of tools, putty, paints, and not much room. I have a small, flexible mat, and a self-healing mat, both under 6"x6" -- the cutting mat is slightly smaller than the flexi-mat. Then I use the tray that is usued for the glassware and such as a "catcher" for parts. In fact, we've had some night-desk people at motels/hotels just give us one. An engine is also a good take-along project. Just remember to take some extra wiring and plumbing material, and extra PE pieces! I like to use small zip-top craft bags to keep things separated. They range in size from about 1"x1" up to 3"x6". VERY handy!!!