This pattern generator details the 2D fabric panel sized needed to achieve desired 3D dimensions of a rectangular zip pouch. Referencing the image, provide the desired dimensions for finished size pouch.
There are tons of fabric options. Learn more about technical fabrics, recommendations, and trusted vendors in our new Fabrics Guide. Here are a few recommendations.
With the zipper closed, you should have a cylinder with fabric's wrong side out!
You should now have a flat zip pouch that you can open and close with the zipper. In the next step, we'll give it some volume.
If everything went to plan, you can now trim your corners. To prevent fraying, take the time to bind your seams with bias tape or grosgrain ribbon.Congrats! You now have a functional zip pouch, hand made to your exact dimensions!
Zippers come in many sizes and styles for various apparel and bag making applications. For zipper pouches and backpacks, plastic coil zippers offer a good balance of durability and cost. Compared to "Vislon" (plastic molded tooth) zippers, coil zippers work well along curves. Plastic teeth are less likely to scratch your belongings and won't corrode like metal teeth.
Additionally, coil zippers are easily sourced at local crafts stores or online supppliers in fixed lenghts with little variation in cost. I typically buy 18 inch zippers and cut them to size. Most specialty stores offer coil zipper tape off a spool since plastic toothed zippers can be cut with scissors or rotary tool. These stores sell sliders of various styles that match the tape of choice. Note, sliders are often specific to zipper tape so be sure to select compatible items.
Water resistant zippers are now commonplace, however are significantly more expensive and the polyurethane (PU) coating is subject to UV damage. PU coated zippers are harder to find in small tooth sizes (less than #5) and require more force to open and close than the standard options. If you go this route pay close attention to select compatible zipper pulls.
For ultralight and backpacking zip pouches, size #3 or #5 coil zippers are recommended.
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