The choice of material significantly impacts product shelf life and user experience. PET (Polyethylene Terephthalate) is the most common choice due to its high transparency, lightweight nature, and excellent chemical resistance to alcohol-based gels. For premium brands, Glass offers a high-end feel and is 100% recyclable, though it increases shipping costs. If durability and squeeze-ability are priorities, HDPE (High-Density Polyethylene) is ideal as it is impact-resistant and provides a matte finish that hides scratches.