Actual Volume of a 1 Gallon ZipLock bag

I was mixing some saline solution and needed to know, so here it is in case anybody else is looking. 😎

A “One Gallon” (1 Gallon) ZipLock bag holds approximately 3,790 ml of Water, which equals 1.00121 US Gallons,  even though it appears to hold slightly more

The precision is actually quite surprising for a plastic bag.