Hi there, thank you for your review. I'm so sorry to hear you had trouble closing your container. That is not the experience we want for our customers. To help promote a tight seal, we recommend making sure that the sealing rim of the can has been cleaned. Additionally, you can use a rubber mallet with a light touch to seal the lid down. Please note that we do not recommend using a hammer as that can deform the can and allow air in. In any case, your satisfaction is important to us, and we appreciate your feedback. Please reach out to us directly if you need further assistance; our Customer Care team is happy to help! -Lina