What's in the package? 1 × Water bottle 1 × One-hand opening lid 1 × Instruction Questions& Answers ①Q: What's the material of water bottle? A: Non-toxic & BPA free Tritan. Tritan is Non-toxic & BPA free materials for infants and young children in the United States. ②Q: Why the water bottle will sweat after filled with ice water or put in ice cubes? A: Because the bottle is relatively cold at this time, the water in the air will be adsorbed on the bottle and condensated into water droplets, and when the water droplets accumulate enough, it looks like sweating. This is a normal physical phenomenon. ③Q: Why the full-water bottle will be cracked after a overnight freezing? A: Because when the water freezes into ice, the volume becomes larger. And when the water freezes, it begins to freeze from the upper layer, so there is not enough space for the ice below, lead to the bottom of bottle will be split by ice. So we don't recommend you freeze the full-water bottle. It is recommended that you add ice cubes to the bottle if you need cold water. What are the advantages of Kitart water bottles? We have observed most of the water bottles on the market and found that most of them require both hands to open, which undoubtedly brings inconvenience to us to drink water. After our investigation, we found that more people wanted to open the lid quickly with only one hand when drinking water, so we repeatedly optimized our lid until this lid appeared. Imagine that when you are cycling, running, and playing Xbox, you pick up the Kitart water bottle and gently press the switch button, the lid pop up, then you can drink the water using only one hand. It won't interfere with your current job at all. How convenient!