3. Oil Blotting Papers

Keep a pack of these absorbent thin sheets in your purse for those moments when you need a quick touch-up while you're out on-the-go. These blotting paper sheets are a must-have for women with oily skin, but can also come in handy for women with combination skin-or even dry skin-at the end of a long, hot day or a 4-hour flight.

4. Exfoliator

Once or twice a week, you'll want to exfoliate your skin to get rid of all those dead skin cells. This will not only make you feel great, it will also brighten up your skin and give you a healthy, natural glow. When choosing an exfoliator, it's important to make sure you pick one with a natural exfoliate, like salt, crushed-up beans or seeds and the necessary essential oils to balance them out.

5. Tinted Lip Gloss

We're all about must-have beauty products that perform double duty. A tinted lip gloss will moisturize lips while providing an attractive hint of color and shine. While you won't get as strong of a color "pop" as you could with a heavily pigmented lipstick, a tinted lip balm can usually be applied sans mirror, meaning you can reapply on-the-go, which is essential for any must-have beauty product. Must-have beauty products should be quick, simple, and give great results through minimal effort.