What kind of closure is the "saltregi" mentioned in the description?

Here, saltregi refers to a closure component that keeps the bag opening closed^[2]. On HATCHINGROOM's Wavy Bag Mini, this component closes the opening and prevents items put inside from spilling out^[3]. However, the actual working mechanism—such as whether it fastens with a magnet, tightens with a drawstring, or hooks onto a loop—has not yet been confirmed. In general, bag closures differ in opening and closing actions and how wide the opening opens depending on their mechanism (such as zippers, magnetic snaps, snap buttons, or drawstrings), so it is recommended to check detailed images or the actual product before purchasing.