How to Make a Two-Way Bag Zipper with Continuous Zipper Chain (Step-by-Step)
Posted Monday, June 02, 2025

If you've ever used a backpack or piece of luggage, you've likely encountered a two-way bag-style zipper. These ingenious closures feature two sliders that meet in the middle, allowing you to open the bag from either direction for easier access to your belongings. What makes them particularly useful is their flexibility—you can position the sliders anywhere along the zipper track and open from that point, giving you partial access without fully unzipping. The good news? Creating your own custom two-way zipper is surprisingly straightforward with continuous zipper chain and the right technique.
If you prefer a video guide, we have a whole video on this process as well.
Getting Your Materials Right
The foundation of any successful zipper project lies in choosing compatible materials. You'll need continuous zipper chain and two sliders, but here's the crucial part: they must be perfectly matched. For example, if you're working with #5 nylon coil zipper chain, you'll need #5 sliders specifically designed for nylon coil chain. Mixing incompatible components will result in a zipper that doesn't attach, doesn't function properly or fails entirely.
When selecting sliders, while any compatible option will technically work, non-lock, long pull sliders are the gold standard for bag applications. The extended pull tabs provide a better grip, making them easier to operate when your hands are full or you're wearing gloves. The non-lock design ensures smooth movement along the chain without accidentally catching, which is essential for the frequent opening and closing that bags typically endure.
Since continuous zipper chain and sliders are sold separately, take time to verify compatibility before starting your project. Many suppliers offer compatibility charts and resources to help you make the right choice.
If you're unsure how to do this, see our Zipper Slider Selection Guide.
Understanding the Head-to-Head Configuration
The secret to a two-way zipper lies in what's called a "head-to-head" configuration. Each zipper slider has a rounded "head" side and a flat side. In a traditional one-way zipper, sliders face the same direction. But for a two-way setup, you'll position the sliders so their rounded heads meet in the middle.
This arrangement is what enables the zipper to open from the center outward, rather than from one end to the other. When both sliders are positioned together in the middle, pulling them apart creates an opening. You can then move either slider along the track to adjust the opening size or reposition where the bag opens.
Step-by-Step Construction Process
Start with your continuous zipper chain—it will arrive as a raw, unfinished length without any stops or sliders attached. This blank canvas gives you complete control over the final zipper length and configuration.
Attaching the first slider is straightforward but requires attention to detail. Slightly separate the zipper chain at one end, then carefully feed it through your first slider. Whether you're working by hand or using a zipper attachment tool, the key is to pull the chain and position the slider simultaneously to ensure proper engagement with the zipper teeth.
Adding the second slider requires identifying the head side of your first slider—that's the rounded end. You'll attach the second slider to the opposite end of your zipper chain, but here's where the magic happens: position it so that when complete, both slider heads will meet in the middle. Feed the chain through this second slider, ensuring the heads are oriented toward each other.
Once both sliders are attached, test your creation. You should be able to bring both sliders together in the center, then pull them apart to open the zipper from the middle. The sliders should move smoothly along the entire length of the chain, allowing you to open the zipper from any position.
Tools and Techniques
While it's entirely possible to attach sliders by hand, a zipper jig or attachment tool makes the process significantly easier and more consistent. These tools hold the slider steady while you feed the chain through, reducing the chance of misalignment or damage to the zipper teeth. If you're planning to make multiple zippers or work on several bag projects, investing in a quality attachment tool will save time and frustration.
Hand attachment requires more patience and steady hands, but it's perfectly viable for occasional projects. The key is taking your time and ensuring proper alignment before applying pressure.
Ready to Zip
Creating your own two-way bag-style zipper opens up a world of possibilities for custom bags, backpacks, and luggage projects. The technique is simple enough for beginners yet versatile enough to handle professional applications. Whether you're repairing a favorite bag or designing something entirely new, mastering this fundamental skill gives you complete control over one of the most important functional elements in bag making. With practice, you'll be creating custom zippers that perfectly match your project's needs and aesthetic.