I have used Contigos for years. My first ones didn't have pull lever inside the lid for cleaning and no seal lock. I loved the improvements that allowed better cleaning in the lid and the seal and lock. I could carry it in my purse and not worry about leaking and beverage stayed hotter or colder longer. But last summer I bought a new one to keep in our RV. I was so DISAPPOINTED with the lock. It was so hard to lock or unlock with one hand. So if you decide to buy a Contigo, check that it is easy to use the lock. So sorry a great product was redesigned.