Two-Way Zipper: Two-Way Zipper (双开尾拉链)
A zipper fitted with two sliders that face each other, allowing the opening to be adjusted from both the top and the bottom. It is common on long coats, sleeping bags and luggage where partial opening improves comfort and access. Both sliders must be correctly oriented and matched in gauge, and the chain needs a top stop at each end. Two-way zippers are tested for independent slider movement and locking performance.