What role does the top wire of the WIRED BUCKET play at the bag's opening?

Where your hands touch the rim of the bag's opening, there is a wire running along the inside. The wire is an iron-core auxiliary material that changes shape when pressure is applied by hand and maintains that form even after you let go.

MARGESHERWOOD's WIRED BUCKET uses this top wire to adjust the closure shape of the bag's opening^[1]. Instead of a device that completely interlocks and closes the opening like a zipper or magnetic snap, you directly determine how much the inside of the bag opens by gathering or widening the circumference. The bag body has an integrated structure seamlessly connected with the handle strap^[2].

The shape of the opening is not fixed to just one form. If you grasp it lightly with your hands, it gathers into folds, and if you pull it to both sides, it opens into a cylindrical shape. hmmm, rather than being a tight closure, its purpose is closer to helping you adjust the bag's outline on the spot to match your fingertips holding the handle.