Reusable water bottles are certainly popular, but aren't always stylish — or taste-friendly. Sigg Bottles ($15-$30) are not only stylish and taste-neutral, they're also available in a variety of sizes and different interchangeable caps to make sure you get the one that's right for you. There's the kid's bottles, with available grips and kid-friendly caps, lifestyle bottles with unique graphics and sizes up to one liter, and the traveler and sport bottles, which come in a wide variety of colors, finishes and shapes. Our favorite? The Traveler Oval Black Flask with Cup ($30), which has retro looks and includes a detachable cup.