They are loaded with vitamin C (a 100g serving has 23 mg or 35 percent of the recommended daily allowance or RDA), but are low in calories (only 43 calories per 100g serving) and sodium. They are an excellent source of both soluble and insoluble fiber.
One cup of blackberries provides 62 calories, 0.7g fat, 14g carbohydrate, 8g fibre and 233.3mg of potassium.
Blackberries are packaged in transparent clam shell cases to protect them from bruising during delivery. Clam shell cases also allow the blackberries to breath while in storage and limit human interaction with the blackberries helping to prevent food contamination.