A keeping is a type of weave made using the One Power.
Keepings are usually used on food, preserving them for as long as is needed. With a constant keeping present, food can go unspoiled for years on end.
Keepings do need to be reinforced every so often, depending on the length of its existence and the quantity that it has been placed on.
Lately, keepings have begun failing after mere hours, or even minutes due to the Dark One's touch on the world as he begins breaking free.