Milk in a bag??

I have never seen this before - milk in a bag!!! I was soooo stunned to see this i just couldn't move for ages and had to phone a friend to say WTF????

I had this image of me coming into the kitchen in the middle of the night half asleep opening the fridge and taking out the bag, cutting the corner off and taking a few gulps (yes i drink milk from the bottle!!) then putting it back and splosh - it goes everywhere!!!! It's not practical .... it's not right!!!

Apparently you buy it like this then poor it in a bottle ..... just buy a bottle of milk!!!!!

I don't get it!!! It will baffle me forever!!!