In almost every winter skincare guide on the internet, you'll find a few tips that every dermatologist or skincare expert recommends. Generally, the idea is get more moisture, and one of the best ways to do that is with a humidifier. The bedside versions are great, but what if your office is one big box of stale, dry air? That's 8-12 hours of dehydration! The jetsetter encounters a similar problem: recirculated, dry-as-a-bone airplane air and stuffy hotel rooms wreak havoc on skin and respiratory systems. A portable humidifier might seem excessive (am I really going to carry one of those around??) but they're actually amazing and incredibly handy to have on-the-go. Here are five of our favorites: they're easy to use and totally fabulous.