Go to Meijer and get the 8 oz. freezer jars. They are with the canning supplies.
Also buy the INSTANT fruit pectin - also in that section.
I used two quarts of berries and that made six jars.
You just clean your berries and mash them up. I leave mine a little chunkie because my kids love the chunks of fruit in their jam. For TWO jars of jam ... the recipe calls for 1 2/3 cups of mashed berries ... 2/3 cup of sugar and 2 Tablespoons of the pectin. Multiply that by as many batches as you want to make. You ladle it into the jars ... let it sit 30 minutes and then put it in the freezer. We just pull out a fresh jar as needed and it keeps for a long time. It's so yummy and fun for the kids.
Enjoy - the berries are great right now!!