Why this lid earns its place
A cover is what separates stock that is in store from stock that is merely sitting there. It keeps dust, splash and anything passing overhead out of an open ingredient, and it keeps dry goods from drawing in the damp and the smells of the room they are kept in. In a store room where flour, sugar and prepped stock share the same air as deliveries and cleaning, that boundary is the difference between an ingredient you can still use in a fortnight and one you cannot.
Lids lead a harder life than the containers they belong to. They come off at every single use, get set down on a wet bench or the floor in the middle of a rush, and travel to the wash-up separately from the container, which is why a store room always ends up with more vessels than covers. Buying the cover on its own puts a stranded container straight back into rotation rather than replacing a working pair. It is moulded in white polyethylene, so it cleans down on the same round as the rest of the store kit and shows plainly when it has been missed.
