The Square ($40) is bottle that opens at both ends. This is yet another innovative product born of a bike enthusiast. The accessible design prevents mold and other harmful growth and allows for really easy cleaning and drying. While the body is food-grade stainless steel, the lip of the bottle is not- preventing that strange metallic taste. Clean Bottle donates 10% of its profits to water friendly eco-charities (awesome), and the Square is guaranteed for life.