The water bottle features a secure screw cap to prevent any leaks. For optimal cleaning, the lid and mouthpiece can be disassembled into individual parts. The plastic lid is made of polypropylene (PP) and is BPA-free. The bottle, which holds 250ml, is made of 18/8 food-grade stainless steel. It has no inner coating and is heat-resistant. However, please note that it is not insulated, so hot drinks should not be filled into it. Please avoid filling carbonated beverages, as excessive pressure could cause the bottle to leak. Hand wash only, not suitable for dishwasher.