BPA-free Plastic: Lightweight and easy for kids to carry. Stainless Steel: Durable and often provides better insulation for keeping drinks cold or hot. Silicone: Flexible and shatterproof, suitable for younger children. Design and Size: Kid-Friendly Size: Choose a bottle that fits comfortably in a child's hand and isn't too heavy when filled. Fan Design: Ensure the fan feature is safe for children to use and doesn't pose any risk of injury. It should be easy to operate and integrated into the bottle design. Safety: Non-Toxic Materials: Ensure all materials are free from harmful chemicals like BPA and phthalates. Secure Lid: Prevents spills and leaks, and also keeps the fan mechanism safe when not in use. Ease of Use: Simple Operation: The fan should be easy for children to turn on and off. Easy to Clean: Parts should be easy to disassemble and dishwasher safe if possible.