Cola in a plastic bottle seems to go flat faster, but maybe that's because it's often a larger size (20oz vs 16 or 12oz)? Or maybe with a can you feel compelled

Cola in a plastic bottle seems to go flat faster, but maybe that's because it's often a larger size (20oz vs 16 or 12oz)? Or maybe with a can you feel compelled to drink it more quickly because you can't re-close it? The test in the video doesn't seem valid because they didn't cleanse their palates in between drinks, and drinking one after the other would likely affect the taste somewhat. They're also influencing each other's decisions.