These lids are ruin my life. Opening a new carton of… literally anything ends up like this. Who decided to rollout a non-watertight member for products that all need to be shaken?

So I’ve never trusted any carton lid to be watertight, so I don’t shake things that are open – not sure if it will help but basically instead of shaking you hold down the lid, and then tip the whole thing upside down, then back up, then upside down, and you just do that a few times and it mixes it all through. If it’s a really unconvincing lid do it over the sink just in case. 

This technique brought to you by those rectangular tetrapaks with the shitty little flap lids. You still get pineapple juice in them, and some concentrated orange juice needs “shaken” too, but back in the day soya milk and rice milk both came in those too. Except the really cheap soya milk which came in a cut off corner tetrapak – you can fold the corner back down and hold it and “shake” as described above but that ALWAYS had to be done over a sink hahah.