These caps are smaller to reducing the amount of plastic needed to produce them. The height of the bottles has been reduced too. When you consider the number of bottles produced every year, the savings in materials and costs are significant. I've seen them on the 500-ml bottles and imagine that they will soon be showing up on the 1, 1.5, and 2L bottles soon. I like the way the shortened bottles look, and while they're a bit harder to grip, my only gripe with these caps is that the mycokerewards codes are harder to read due to their liners
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Drink responsibly....drink soda!