Divide chicken evenly among freezer bags
In a small bowl, combine soy sauce, sugar, vinegar, and oil, stirring until sugar is dissolved. Divide marinade evenly over chicken; into each bag, measure 1 teaspoon garlic and 1 teaspoon ginger.
Seal and gently shake each bag to combine contents. Freeze. Food will stay at optimal quality for up to 3 months in freezer.
Completely thaw one freezer meal in refrigerator.
Preheat oven to 350°F (180°C).
Place chicken in an ungreased baking dish. Bake, uncovered, for 1 hour or until an instant-read thermometer inserted into thickest part of chicken reads 165°F (74°C). Turn pieces once or twice during baking. The longer the cooking time, the thicker and stickier the sauce will be.