There is space for up to 15 bills. How many fit in depends on the size of the bills and the number of cards you have stored inside.
Your coin compartment has a sturdy zipper and can hold about 15 coins. But again, the exact number can vary depending on the size of your coins and what else you have with you, such as an AirTag to track your BROSHIELD in case you lose it.
In short, how much fits in your wallet depends mainly on the size of your bills, coins and what else you want to take with you.