Pretty simple cover that slides onto the tray of some pills and keeps them from popping out in your bag. I have a couple of these made for a few different things I travel with which I included here, but I think this is more about the idea and you can make some with your own dimensions you need. I included the .f3d and .step to make that easier hopefully. 

I do include the name of the medication since once you have a bag of these all in Prusa orange they all look the same. Maybe don't be like me and pick a colour scheme and save yourself the trouble.