Everybody loves a ziplock! They’re so handy to sort things and keep organized. However, they’re not the best for fabric storage. It’s better for cotton to have airflow, so you don’t want to seal it up tight. If you put blocks in a ziplock, snip off the corners!
I also like to leave the top unzipped for some extra airflow. If you seal fabric in an airtight container, it can trap moisture and bugs.