How to Make Perfect Box Bottom Corners on a Bag Every Time
With my step-by-step sewing tutorial, you can easily and accurately box the bottom corners of your next bag creation. A box bottom means the bag has a flat bottom, making it easier to hold wide items or rest comfortably. Be sure to grab a FREE (a $9.95 value) printable tutorial below.
Box Any Tote Bag or Purse Pattern Project
This tutorial uses our free With Love Tote bag pattern, which you can download here. The side seam (left) and bottom seam (right) meet, and a seam is stitched across these seams, giving the bag dimension and structure.
How Boxing the Bottom Corners Affects the Bag Size
Boxing the bottom corners gives a bag a flat bottom to stand on, but it also’steals’ from the width and height, resulting in a bag that is narrower across the width of the bag at the bottom seam and shorter in height along the side seam.
1. Determine Desired Size of the Boxed Corner
Start with a smaller cut to see what you think; our tutorial shows a 4u2033 deep boxed corner. Divide the desired 4u2033 depth by 2 = 2u2033 2u2033 is the size of the square.
2. Mark and Cut Squares From The Bag Corners
Following my Pinterest board Free Sewing Tutorials, Tips and Tricks for more free sewing tutorials, mark a 2u2033 square on both bottom corners of each piece and cut the marked square from each bottom corner.
4. Stitch Closed to Box the Bottom Corners
Backstitch at the beginning, where the seams match, and at the end of the cut edge to close the corner. If desired, reinforce by stitching again for extra strength in the corners or seams of a finished quilt.
5. Finishing Details
Give your bag more support by boxing the bottom corners and pressing it right side out with my Easy Sew-In Bag Support trick. Need a better ironing board? Check out the IKEA Hack Pressing Station of my Dreams, here.
Boxed Corner Cut Sizes and Finished Bag Sizes for This Tote Bag Project
Follow Joan on Pinterest and pin this post to your Pinterest boards to see how different size corner squares affect the finished size of our sample project.
How do you calculate box corners?
1. Decide on the size of the boxed corner you want.
- Our tutorial shows a 4u2032u2032 deep boxed corner.
- 2u2032u2032 is the size of the square that will be cut off of both bottom corners when you divide the desired 4u2032u2032 depth by 2.
How do you sew a mitered corner?
Mitered Corners: How to Sew Them
- 2) Iron the hem over again with the same width.
- 3) Unroll one fold of the hem on the corner.
- 4) Fold the corner in diagonally.
- 5) Mark along the diagonal crease with chalk, pencil, or fabric pen.
- 6) Fold the fabric over and sew along the marked diagonal line.
How many corners does a box have?
A square has four corners, so a cube made up of six squares has 24 corners. I’m defining a corner as a 90 degree angle; if you define a corner as being in xyz coordinates, a cube has eight corners. A cube’s edges are shared, which means each square shares an edge with another square.
How do you upholster the corners of a seat?
Pull the “Y” flap straight over the corner and staple it securely. Pull each edge of fabric on each side of the corner straight over the seat cushion and staple each to the backside of the cushion. Repeat with each corner.