Clean Bottle recently released Square, a sleek new water bottle. "We really wanted to apply high design to something that hadn't been improved much over the years," says David Mayer, Clean Bottle's founder. The vessel unscrews at either end to make cleaning a breeze, the square shape ensures that the bottle won't roll away, and the compact size fits into most cup holders. Square is made out of stainless steel (with a smudge-proof finish) and BPA-free plastic and retails for about $45. Find the modern water bottle at rei.com.