Pretty sure it's about 300ml or so. I didn't find the taste bad. It just got too sweet for me. At fisrt it was okay, but by the end it was just really sweet. They give you about 10 minutes to drink it all though, so as long as you pace yourself you should be ok.

I coulnd't beleive how many calories it had either it was probably more then double the calories that are in a can of soft drink!