My do not forget includes:
The over the door shoe holder (invaluable organizer and space saver)
My medications (In their original containers)
My favorite pillow. I know, I know. They have pillows on board, but I started using a certain kind of Japanese Buckwheat husk pillow years ago. It takes very little space, but offers great support. I have tried traveling with out it several times. I just end up missing it!
So, I would take anything that my daily comfort depends on!
LisaCA