Universal Fit: Designed for Thermoflask bottles in 14oz 16oz 18oz 24oz 32oz 40oz and 64oz sizes, these straws provide a secure, leak-resistant fit suitable for various capacities. Durable & BPA-Free: Crafted from food-grade, BPA-free plastic, ensuring safe hydration no matter where you go. Easy Customization: Includes a measuring guide and cutting tool so you can easily tailor straw length to perfectly match your bottle size, preventing awkward bending. Enhanced Hydration: The flexible plastic construction provides a smooth, consistent flow of water without leaks or kinks, making it perfect for workouts, travel, and everyday use. Easy to Clean: These odor-resistant, non-porous straws are quick to remove, easy to wash by hand or dishwasher safe. They retain their shape after repeated cleanings.