I have designed this box for condoms, tampons and stuff which is almost perfect: https://www.printables.com/cs/model/371842-smooth-pocket-case-for-condoms-durex-tampons-etc

The only downside is that you have to trim the corners of condom wrappers. If you don't mind that, then I suggest you print the above mentioned model, since it's slightly more smooth. But if the idea of using scissors anywhere near your wrapper scares you, then this model is for you.

Slicing:

Use three perimeters!

Assembly:

Use filament wire for the hinge. In this model I have tried to hide the hinge as much as possible, so it is a little bit harder to insert the filament, but there is probably zero risk of it accidentally slipping out. First slip the filament into the opening of the top piece, then put the two pieces together and push it all the way in.