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Airless pump bottles have become a popular packaging choice for serums, lotions, moisturizers and other skincare formulations. Their dispensing system is designed to limit a formula's exposure to outside air during normal use while helping consumers dispense the product in controlled amounts. Unlike a traditional pump bottle that commonly uses a dip tube, an airless bottle generally relies on a platform or piston inside the container. Each time the pump is pressed, the platform gradually moves u …