20 grams of collagen peptides is a standard serving size that occupies a volume of 3.38 tbsp (50 mL). When poured into a loose pile, it is about the size of a large egg.

In kitchen measures
3.38 tablespoons
10.1 tsp · 3.38 tbsp · 0.211 cups
about the size of a large egg
Collagen peptides typically ranges 0.35–0.5 g/mL depending on how it's packed. A firmly packed scoop weighs more.