The gasket looks way smaller than my large jar seal so, on sight, I thought I would have to return the packet. However, the gasket fits my jar lid perfectly. Perhaps because I have small hands, I found it difficult to position it inside as it requires of some strength to stretch the gasket to then let it fall inside. The gasket stays tightly in without getting out despite the fact that I wash the jar and lid every day. This gasket is designed to match the Thermos Stainless King Food Jar, which is slightly different from my old food jar model, yet it fits it greatly. Great price, but I wish this sort of spare part was sold by the unit or the pair because, unless you have a large family, this packet has more gaskets than I need and it's a waste of product.
