Here are the dimensions of a case. Not knowing the size of car can't guess but hopefully that helps. 18 3/8 x 12 ¼ x 6 1/16
Like 6 maybe depending what can a car u have.
It depends on what kind of car you have and if you are able to fold your seats down. I organized an event for my daughter's school a few years ago, and I was able to fit 14 to 16 cases in my Nissan Altima. I also brought with me bungee cord so that I could be sure the cases did not fall over in my car
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