Lékué's Filtered Bottle To Go is designed to improve the taste of water. This bottle incorporates a 100% natural filter made from coconut shell activated carbon, which reduces the substances that alter the taste of the water. This product is easy to fill and clean. It can be opened and closed from the bottom or from the mouth, thus facilitating filling and cleaning. 100% airtight and with wide mouth for a better drinking experience. It is recommended to read the user manual for its correct use.