Prep the berries. Gently wash and dry the strawberries. Remove the hulls and green tops with a small paring knife.
Freeze on baking sheet until fully frozen. Spread berries in a single layer on a rimmed baking sheet. Berries need to be very hard before proceeding.
Freeze in freezer bag. Place in a gallon-sized zipper bag. Close the top, gently pushing out the air. Insert a straw into the edge of the bag and suck out any excess air.