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This case study introduces the XUZHOU TROY Silicone Dual-Fit Mason Jar Lid, a versatile and user-friendly innovation designed to fit both regular and wide mouth mason jars. Featuring a flippable, removable stopper with 9mm and 12mm openings, the lid supports straw-friendly use while ensuring an airtight, leak-proof seal. Made from food-grade BPA-free silicone, it is dishwasher-safe, reusable, and ideal for drinking, food storage, and daily hydration. The lid eliminates the need for multiple jar lids, offering a practical, eco-friendly solution for modern kitchens and active lifestyles.