I think maybe you could render out the juice through cheesecloth and freeze it in quart bags. Use a little salt and lemon juice on it to preserve the berries from going bad. This way, you can take out a bag for say blackberry tea or making jam in the fall. Lucky you to have so much now on hand. My cherry tree got frozen back in the spring, and I only harvested one small quart-sized bag in total. There have been so many families sorrowed by this. We normally share huge bags with hubby's work friends, our family and friends here in the neighborhood. So many people asked what happened to my cherries? I felt so bad.