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Can glass jars be used for freezing?
Regular glass jars break easily at freezer temperatures. If using glass jars, choose wide-mouth dual purpose jars made for freezing and canning; these jars have been tempered to withstand extremes in temperatures. If standard canning jars (those with narrow mouths) are used, leave extra headspace in liquid packs (3/4-inch for pints; 11/2-inches for quarts) to allow for expansion of food during freezing and completely thaw food before removing it. Do not use regular canning jars for foods packed in water. Source: Original FAQ posted at http://220.127.116.11/faq/FAQ_home.php