I agree with the need to standardize phone chargers, but that's quite a different market. It is much more likely you'll let someone borrow your charger than bo

I agree with the need to standardize phone chargers, but that's quite a different market. It is much more likely you'll let someone borrow your charger than borrow your bottle top, and also more likely that you'll buy a spare charger than a spare bottle top. Bottle tops are also probably easier to recycle than cables.