This baseball/softball number bag tags can be made to match team colors and personalized to match your jersey number. This would make a great senior gift as well. 

Files can be scaled down to make a perfect keychain; the 2026 in my pictures were scaled to 50% with no issues.

Numbers 0-9 are provided in the files, but double digit (or more) can easily be assembled in PrusaSlicer to match your needs. In order to print multiple numbers together, size and place them as you want them on the slicer tray. When they are placed, highlight all the files.

Then right click and choose "merge" and they will become one object ready to print after slicing.