I use Fresh Step litter for my cat, it comes in a big bag. That bag is held closed by a string that runs along the top like the bag has been sewn shut. It looks like I should be able to pull on part of the string or the white paper covering the bag that the string also goes through and it should just "zip" open.
This does not work. What am I supposed to do to open the bag? Currently I cut it open, but that's not what is supposed to happen.