The sample jars are about a 1/4 teaspoon of powder, which will last forever if you're trying out the multi-use pigments, or a few applications of foundation (enough to test the color well before making a commitment). The baggies have about the same amount of powder, just in a baggie instead of a plastic lidded jar. Personally I prefer the jars. A full 5g jar is the same size jar as the sample jar but it is packed full of powder, probably about 2-3 teaspoons of product.

These guys really pack their jars to the brim so when you order a 5g jar of powder you get a full 5 grams.