Don't you hate having to dig through the cabinet to find the lid for your child's sippy cup and toddler milk cup? Well now the lid is attached, making these the most convenient sippy cups! You will never have to look for misplaced lids again! Tough enough for any kid, you can take, toss and travel with this great design. These cups are leak proof, spill proof, and extremely durable making them perfect for inside or outside. They are also so easy to store in the cabinets and stack perfectly facing up or down. Having the lid attached is a dream to clean as well, and they also fit great onto the top shelf of the dishwasher! Designed and approved by a mom of 3 littles. Happy child and happy adult. Sip E-Z!