Vaseline aka petroleum jelly for me fits the bill for what is the most important cosmetic in my beauty arsenal. It does so many things that i actually just wrote a Hub about it. Armed with vaseline, you can moisten and bring out your lip color, use it on your eyelashes for a quick lift and then after the night is done you can also remove your makeup with it. You can also tame frizzy hair with petroleum jelly as it works to smooth hair while at the same time conditions any dryness. For you hands, vaseline is great for the cuticles as well as softens any rough spots on your hands and feet.
I could go on and one, but for sure it is one beauty product I never leave home without!