This is a little key chain thing that you can put on a zipper on your backpack. I always carry a small first aid kit in my backpack, and i connected this to the zipper on the pouch that it is in. Now if someone needs it, they can immediately identify what pocket it is in.

i printed the file twice (at the same time) to make the final product. Here is how I did it

insert two of these into cura go to [extensions] > [Post Processing] > [Modify G-Code] click "Add Script" and choose "filament change" set the filament change to happen at the layer where it starts printing the cross.

Export the file to your printer, and start the print with white PLA. When the printer is ready for a filament change, use red filament. This gives it a multi-color design.

Remove the parts from the printer and super glue the 2 sides back to back, making sure the holes align (you can use a toothpick for that)

Add a keychain ring and attach it to the zipper on your first aid pocket.