Pour the clean, dry blackberries into a bowl. Sprinkle sugar over the blackberries—you'll need 1/4 cup of sugar for every 2 cups of blackberries.
With your mixing spoon, gently mix the blackberries and the sugar together until the berries are evenly coated in sugar. Do not crush the berries.
Gently spoon the sugared blackberries into an airtight, freezer-friendly container. Important: don't crush or pack the berries down, and leave about 1/2 inch (or less) of room at the top of the container for expansion.
Write today's date on a freezer label, stick it to the container, and place it in the back of your freezer.
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