Understanding #3 vs #5 Zippers
Choosing the right zipper size is essential for successful bag-making. The #3 and #5 designations refer to the width of the zipper's coil or teeth—a critical specification that determines which bags and projects each works best for.
What's the Difference?
#3 zippers have a narrower coil (3mm) and are ideal for smaller projects like pouches, phone cases, and detailed bags where a delicate closure is needed. #5 zippers feature a wider coil (5mm) and provide a more robust closure, making them perfect for tote bags, larger pouches, and everyday carry items that experience frequent use.
In this short video, we walk through real examples of both sizes and show how they perform in finished bags so you can see the visual and functional difference side by side.
The photo below shows a #5 size zipper toward the top and the #3 size toward the bottom.
Installing Zipper Pulls
Once you've selected your zipper size, adding custom pulls elevates the finished look. Our zipper jig demonstration (2 minutes) shows how to attach pulls quickly and securely to either #3 or #5 zipper tape.
Practice Project: Quick Zipper Pouch
Ready to put your knowledge into practice? This 10-minute zipper pouch project is the perfect way to test both #3 and #5 zippers in real-world construction. You'll quickly develop a feel for how each size handles and performs.
Key Takeaway
Match your zipper size to your project scope: #3 for delicate, detailed work and #5 for durable, high-traffic bags. With the right choice and proper installation, your handmade bags will have closures that feel professional and last through regular use.
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