Flat coke

We buy min 4L of coke a day. Our house hold loves Coke. But we are struggling with the new caps. Our unopened cokes are flat. As soon as you open it there is not no gas escaping. Some even leak and we have not even opened it.

We can't keep on buying 1.5 and 2L cokes and having to discard a barnd new coke because it is flat. You can't even close a cap and drink further the next day as it will be flat.

Really becoming a huge problem and a waste of money on a daily bases.

Very disapointed.