New, Unused, Unopened Thermos Genuine Replacement Parts - Vacuum Insulated Straw Bottle Gasket for FHL Series - Set of 10. - Quantity: 10 pieces - Color: Blue - Compatible Products: Thermos Vacuum Insulated Straw Bottle FHL-400, FHL-401, FHL-550 and all other water bottles starting with FHL According to the Thermos official website, "There is no specific expiration date or lifespan" for the water bottles themselves, and they seem to last for years if cared for properly. However, the gaskets are consumables, and "They gradually wear out from prolonged contact with hot water and repeated use. Please check them approximately every year and replace them if there is any roughness or damage on the surface." Why not consider a bulk purchase at this opportunity? Storage Environment: Stored in a container-type warehouse (protected from UV light and in an environment where it is difficult for everyday odors to cling)