The zipper pouch of my traveler's notebook plastic insert houses paper ephemera, such as an old map print and a decorative paper for French men's watches; things that I find interesting. I was able to add this 1952 3c "Service Women" stamp, a deep blue paper that shows women in uniform from the Marines, Army, Navy, and Air Corps.
It's so small in proportion to the size of the insert, but it was something that really touched me. That's why I found it nice to flip open my Midori and have it as one of the first things I look at. Girl power, am I right?