How much water does an average sized water gun hold when fully loaded?

I was curious about this when I saw some people use water guns near a park on each other. Some of them were big and some were small. They had water guns of different sizes. Please tell me how you know and if you have any experience on this and any experience using a water gun.

Tell me which size water gun you use usually if you do use water guns or have used water guns. Tell me about your water gun usage experience.
How much water does an average sized water gun hold when fully loaded?
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