Features: 1. Easy to Hold: This wide nut has a flexible handle design, which is easier to hold and saves space on your backpack. 2. Make it easy to drink: The wide-mouth cap turns a wide-mouth bottle into a narrow-mouthed bottle, which is convenient to drink. The screw cap makes the cap easier to handle and safer. 3. Wide application: suitable for hydrothermal, takya, modern minimalist water bottles most brands, and also suitable for 12oz, 16oz, 18oz, 20oz, 32oz, 40oz and 64oz water bottles. The shaker cannot be used. 4. Leak-proof and portable: easy to carry, suitable for any outdoor activities. The perfect addition to your water bottle. 5. Non-toxic and eco-friendly: It is made of non-toxic PP, silicone ring and other environmentally friendly materials, so you can use it with confidence. Description: This wide nut has a flexible handle design, which is easier to hold and saves space on your backpack. Easy to carry, suitable for any outdoor activities. The perfect addition to your water bottle. Specifications: Material: PP+TPR Purpose: for hydro flask wide mouth series General purpose airless bottle: 12oz/18oz/20oz/24oz/32oz/40oz/64oz/84oz Package included: 1pc*bottle cap Notes:1. Please allow 0-1 inch error due to manual measurement. Thank you