100 grams of flaky sea salt is 3.53 oz (100 g) in weight and takes up 15 tbsp (222 mL) of space. When poured into a loose pile, it is about the size of a baseball.

In kitchen measures
15 tablespoons
45.1 tsp · 15 tbsp · 0.939 cups
about the size of a baseball
Flaky sea salt typically ranges 0.3–0.6 g/mL depending on how it's packed. A firmly packed scoop weighs more.