Today I learned... teabags in Japan and everywhere else

teabag

To be fair, I'm not sure whether this is only in Japan or in the rest of the world (since Twinings is from the UK). But most teabags I have used do not have any staples. This is very convenient, it avoids any accidental mishaps with microwaves when you want to quickly make your tea and the metal doesn't ruin the taste of the tea.

On the other hand... I noticed that most teabags I have used in Canada always had a staple... why????