I like to use them for traveling or in my gym bag. Instead of taking my whole face wash or face lotion, I add a small portion into a small container. I've reused containers for things like toothpaste tablets, jewelry, earplugs, bobbypins, homemade lip balm or hand lotion, ibuprofen, vitamins, medicine, microfiber cloth for my glasses, when a reusable press-on nail falls off... sometimes I buy products just because I like the container.