This cup features a unique straw that peels open for easy, thorough cleaning and tucks neatly into the lid for germ-free on-the-go use. The one-way valve prevents leaks and spills. Not only is this transition cup clean when it comes to spillage, but it is also sleek and solid-toned in its design. Perfect for tossing into a lunchbox or diaper bag, the straw cup is a practical, stylish, kid-friendly upgrade to regular sippy cups.