I have several vintage machines. I bought 2 of these from Joann's and labeled them : Featherweight, 301. The box has a top tray with some fixed dividers and some removable dividers. Then the bottom tray also has some fixed dividers. At one point I mistakenly got the Large GEAR box but did not like it as well.
In this I can keep my bobbins, feet, scissors, etc. Anything specific to that machine. Since I use take these machines to classes and when I travel it is easy to grab the appropriate box and know that it is loaded with the correct tools for that machine.
http://www.joann.com/med-parts-gear-case/4734083.html