The PET and nylon tea bags tend to be pyramid shaped. From the BBC >This is usua...

		dghughes on Sept 27, 2019 \| parent \| context \| favorite \| on: Microplastics found in 93% of bottled water tested... The PET and nylon tea bags tend to be pyramid shaped. From the BBC >This is usually so that the tea bag is held in a pyramid shape, which producers claim helps the tea leaves infuse better.