What shaped teabags do you buy?

Teabags come in different shapes, the most common being square, pyramid, and round. Personally I don't pay much attention to the shape when buying, but my usual brand is round. However, some people are convinced it makes a difference. Where do you stand?
What shaped teabags do you buy?
Square tea bags
Round tea bags
Pyramid tea bags
The tampon type
Select gender and age to cast your vote:
What shaped teabags do you buy?
Post Opinion