Your lid will leak if:1/ The Silicone Seal is missing. To check if your seal is missing, unscrew the lid and look in the top-most part of the lid threads. There should be a soft silicone seal tucked inside. If you are unable to see it, try putting the tip of a pencil and if you feel it is soft, the Silicone seal is there and should be working well.2/ The threads have not aligned. When you screw the lid onto your bottle/cup/food jar make sure the threads of the body and the threads of the lid fit well. Once screwed on, the base of the lid should sit flush all around the product. If there is a gap at one side, the threads are not aligned. Take the lid off and try again.
If you have tried the above trouble shooting and your product is still leaking, get in touch and we will assist you further. Send your issue, a photo of your product and your phone number tohere.