All bottles age, even our premium TWIST Bottles, with frequent use. When it's time for a replacement, simply detach the magnetic connector from your old bottle using a coin, and attach it to your new replacement bottle. Our Antibacterial FIDGUARD Technology inhibits the growth of bacteria and odors. Replace your bottle while saving resources with the TWIST 590 Antibacterial FIDGUARD Replacement Bottle. Always BPA-Free & BPS-Free. Includes TWIST Bottle. Does not include TWIST Connector or Base.