I had them prepared as spares, but I didn't end up using them, so I'm putting them up for sale now that I've graduated. This is a THERMOS FEO packing set (S) for sports bottles, and it includes a lid gasket. - Brand: THERMOS - Model Name: FEO Packing Set (S) - Application: For sports bottles - Size: S - Contents: Lid gasket Thank you for looking.