How to Make a Boxed Corner

Carla Peicheff



Skill level: Intermediate (Must have basic sewing skills to make a zipper pouch.)

I will teach you how to properly make boxed corners on your pouch and how to get the bottom width size you’d like!

Tools Needed:

OLFA RM-SG 18" x 24" Green Double-Sided, Self-Healing Rotary Mat

OLFA QR-4S 4 1/2" Square Frosted Acrylic Ruler

OLFA 5-Inch SCS-4 Straight-Edge Stainless Steel Precision Scissors

Frixion erasable pen or similar marking tools - chalk, pencil, etc…

Fabric Requirements:

You will need an “almost” completed basic zipper pouch shown to the point below. Zipper has been installed and seam has been top stitched.

Cutting Instructions:

1. Take your 4.5” OLFA Square Frosted Ruler & mark each corner with your pen at 1” width & height.

2. With your 5 nice Straight Edge Precision Scissors cut each corner out of both your exterior & interior fabrics. If you’re afraid the fabrics will slip, pin together.


1. Make sure your zipper is open.

2. Now pin your exterior pieces together and your interior pieces together as you normally would when making a zipper pouch.

3/ Sew around your pouch leaving a gap to flip as per usual.

4. Now take each corner, open the seams and pinch as shown. Pin to hold in place.

5. Sew each corner flat with a ¼” seam allowance.

Your pouch will now look “pillow like” as shown. Flip your pouch & close opening. Your pouch should now have lovely boxed corners giving your pouch a 2” base!


PRO tip! For whichever size you choose to cut your squares, it will give you double the width. So for my tutorial we cut 1” squares and ended up with a 2” base using a ¼” seam allowance. Here’s how other sized squares would measure up!

1/2” square = 1” width
1” square = 2” width
1.25” square = 2.5” width
1.75” square = 3” width
2.00” square = 4” width


The bigger the square is cut, the taller/wider the pouch should be or you’ll end up with an awkward shape, or just simply a triangular pouch! Which is also fun!!

Playing and experimenting is the best way to achieve the look you like!