To use as canning jars, clamp glass lid and rubber seal on jar with two stainless steel clamps (included). Seal tight in water bath or pressure canner. Jars, lids, rubber seal and clamps are all reusable.
Stay-fresh plastic covers must be purchased separately.
Storing milk in the refrigerator - Our glass jars make wonderful milk bottles. Much more attractive than plastic jugs and much easier to clean than small-mouthed bottles!