Klean Kanteen Stainless Steel Loop Cap, One Piece Stainless Steel Leak Proof Water Bottle Cap Leak-Proof Seal Dishwasher Safe. Handy attachment loop Cap comes ready to use on any single wall Classic Klean Kanteen bottle. For use with insulated Classic Klean Kanteen bottles please switch out the retainer piece with the one included in the box Safe, Durable, High Quality Materials No BPA, No Lead, No Phthalates No paint or plastic on this stainless steel loop cap cap-even the logo is etched onto the lid Fits all sizes of Klean Kanteen classic bottles Dishwasher Safe and easy to clean Handy loop is perfect for a D-ring or carrying easily with one finger Silicone inner ring provides leak-free seal