The square bag with a zipper is one of a kind. A simple pattern that transforms into an extravagant bag called Manta. Mysterious. Unusual. And also unusually beautiful. :)
We are sewing a square bag with a zipper :)
Sewing this square bag with a zipper is at least as much fun as using it! ;)
What a discovery it is to sew a bag from a square and two rectangles that has such an incredible and extraordinary shape! It is a mixture of a geometric figure, an eccentric designer piece, a grumpy bulldog, and a manta ray. By the way, this special shape is called a biscornu.
Enigmatic. Spacious and practical. And simply mega beautiful!

I already know that the girls will go crazy for it at our family Christmas party!
That's why I've already started a series production.
In this case, that’s the easiest thing in the world. Sewing the square bag with a zipper means you can sit at your sewing machine or on the sofa. We already followed this principle with our Kosma cosmetic bag.
With the Manta, it's even easier. Because you only have straight seams. You occasionally have to turn left or right. But that's all there is to it.
So, anyone who likes to sew while having a nice chat with their best friend, while watching TV or YouTube, or who wants to sew while sitting on the balcony should definitely sew our Manta bag.
What’s especially cool is that the parts are quite small, so you can easily pack them into a project bag and take them with you.
You can finish the edges of the bag pieces with bias tape or turn them right side out, just as you like.
Both look great, I think.

And because the square bag with a zipper is so easy, you can also make the pattern for it yourself in any size you like.
You always need a square base. This determines how big the bag will be.
And then you need two rectangles that are just as long but only half as wide as your square.
I’ve drawn an example for you here so you know what I mean:

With a base of 20 x 20 centimeters, the bag will measure approximately 19 x 20 cm from corner to corner.
It will then be 7 centimeters high.
You can also use the reduced basic pattern to sew a cute coin purse or a keychain. However, I find that from an edge length of about 8 centimeters, it gets a bit fiddly with the zipper. :)
Sewing a square bag with a zipper - Fabric cutting

What you need for sewing:
- Each of the 3 pattern pieces cut 1x from outer fabric, 1x from lining fabric, 1x from sturdy fleece interfacing (in the instructions, I used my prized iron-on padding*; Style-vil* is also wonderful because it always springs back into its original shape)
- If you prefer to use thin interfacing, you can iron e.g. Vlieseline H 250* or Vlieseline H 640* onto the outer and lining fabric. You can vary this as well.
- Almost 2 meters of bias tape
- If you like a loop: 1 piece of ribbon
- In addition spray adhesive*, sewing pins, needle and transparent nylon thread*, embroidery scissors
- 22 cm zipper* (to create a contrast to the angularity of the bag, I chose zippers with a ring on the pull; I ordered them from Amazon*). This is what they look like:
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