HIGH QUALITY 304 STAINLESS STEEL - Unbreakable, Easy to clean, and easy to travel with. Doesn't leech chemicals or smells. FOOD GRADE SILICONE LIDS - Flexible, Leak Proof, and Chemical Free! 3 SIZES IN ONE SET - This set comes with 3 sizes: 200ml, 400ml, 650ml (6.76 oz, 13.5oz, and 22oz) COUNTLESS USES - Not only are these containers great for snacks and lunches, they are also excellent for carrying non-food items! REUSABLE AND ECO-FRIENDLY