system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Plastic bottle caps used to have a rubbery seal on the bottom and now they don't. What happened to them?
gpt
A few years ago many companies redesigned their containers to use less plastic, especially in the lids. During the redesign they added a small circle lip to the inside of the lid that seals the container in place of the seal you remember.