Generally we recommend 1/2 pint (8 oz or 1 cup) jars for low-sugar jams and jellies. The 1/4 pint (4 oz or 1/2 cup) are a good size also if you’re making the jam or jelly for gifts.
You can use 1 pint (2 cup) jars but it’s important to remember that a jar of low-sugar jam or jelly will last only about 3 weeks in the refrigerator once opened. So unless you and your family can eat 2 cups of jam in 3 weeks, it’s better to use the smaller jars.
The processing time for all three jar sizes of jam or jelly is the same.
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Posted in: 3. Questions About How to Use Pomona’s Pectin, 6. Questions About Jam-Making Equipment and Water Bath Canning