Lifelong Shaker Bottles are dishwasher safe, and made of high quality food-grade plastic that keeps your supplements clean, safe, and bacteria-free. They are designed to be the most convenient, functional, and hygienic shaker bottles on the market. The innovative, leak-proof lid on each Blender Bottle shaker is designed to keep liquids contained. Simply press down on the flip cap until you hear a distinct snap, then shake or stash the bottle with confidence