300 grams of blackberries is about the size of a water bottle. This amount of fruit measures 10.6 oz (300 g) and takes up 2.11 cups (500 mL) of volume.

In kitchen measures
2.11 cups
101 tsp · 33.8 tbsp · 2.11 cups
about the size of a water bottle
Density estimated by AI from typical values. Blackberries typically ranges 0.5–0.7 g/mL depending on how it's packed. A firmly packed scoop weighs more.