I don't know about aluminium, but when it comes to plastic technology doesn't allow them to recycle more than 20% on the first cycle. After 4 it drops below 1%.

And they can't even make 100% recycled plastic bottles (even though they claim they can) because that would mean an unpure plastic which doesn't have the same aesthetic properties than a pure one.

The problem is definitely on both Coca Cola and the dolts that litter.