The current PE lined cups will also leak after some time. They are designed for immediate use, not as liquid storage containers. Most of them, especially the

The current PE lined cups will also leak after some time. They are designed for immediate use, not as liquid storage containers. Most of them, especially the higher quality ones, will usually last a day or two before significantly leaking but not always. Don't leave one on your desk overnight, I've seen the messy results!