Look, there's no technical reason for anyone to carry around a bag of 105 plastic dice divided neatly into 15 polyhedral sets. But then again, maybe you'll be somewhere and someone will say "I've got nearly a hundred dice!" In that moment, you'll wish you had a bag of 105 plastic dice.
You can also just get like a set of 7, or 2 sets for 14 total... It's completely up to you but picture ONE HUNDRED dice.
Each set includes a small drawstring bag.