After losing the original plastic cap for my razor (and almost hurting myself when reaching into my cosmetic bag during a vacation), I improvised and used a big paperclip on the razor head. It fits perfectly and is totally safe to me and others!
Uses For Binder Clips
Storing a Toilet Brush
Using a Binder Clip for Toothpaste
Extending the Life of Razor Blades
Making a Binder Clip Yarn Bowl
Using a Binder Clip for Hanging Keys
Storing Curling Irons and Flat Irons