The size of this thing is one of it’s best features since you can save up to 20 tea bags in each one, so if you have the 4 of them you have storage for 80 tea bags. But if you prefer loose herbs it’s not that precise since you can compress the leaves, but approximately you can fit 3.5 oz of tea. The cans are very spacious, and if you need even more of it you can buy 6 cans instead of 4 and have room for all your tea. Good luck!