Not sure if we're alone, but we have difficulty sometimes removing the seal inside the screw off cap on Coles brand milk bottles - it's just new so I'm not sure if other brands have this but eventually they all will. Sometimes we have to use a pair of pliers to grip the tag as it is slippery.
The advantage seems to be they provide a positive seal allowing the bottle to be stored and possibly transported on their side without leakage.
I now have a pair of pliers to open the milk. Manufacturers couldn't screw on the lid tight enough to seal so now add another layer of sealing. I is OK because the customer will pay for the additional cost.
Jolly nuisance when all you want is some milk for your cuppa. Even my fixit hubby has trouble so he has been using a knife to pierce the seal. Recipe for a disaster...how do older folk and children manage?