25 grams of brown sugar (packed) is a small amount that measures 0.882 oz (25 g). You can visualize this quantity as being about the size of a ping-pong ball.

In kitchen measures
1.82 tablespoons
5.45 tsp · 1.82 tbsp · 0.114 cups
about the size of a ping-pong ball
Brown sugar (packed) typically ranges 0.85–1 g/mL depending on how it's packed. A firmly packed scoop weighs more.