The no-open filling design of bottom refill perfume bottles brings multiple core benefits for end users and perfume brands, covering hygiene, fragrance protection, convenience, and product durability. Different from traditional bottles that need to open the cap and expose the inner cavity for filling, the no-open filling structure keeps the bottle body sealed at all times during the whole filling process, completely isolating external dust, bacteria, and humid air, ensuring the hygiene and purity of perfume liquid. Since the bottle cavity is always in a closed vacuum state, there is no air exchange during filling, which fundamentally avoids perfume oxidation, top note loss, and liquid turbidity. For users, there is no need to disassemble accessories or prepare auxiliary tools, and the filling operation can be completed in one second, which is extremely convenient for travel and outdoor supplementary fragrance. For brands, this humanized design greatly improves product word-of-mouth and repurchase rate. The closed filling structure also reduces the risk of liquid leakage and volatilization during transportation and storage, reduces after-sales problems, and effectively improves product quality stability. Combined with reusable and recyclable characteristics, it also helps brands shape an environmentally friendly and professional high-end image.