If you were to simply sew two squares of fabric together, you would create a very flat bag. While this is great for a gift bag, book bag or simple tote, sometimes you may like your bag to be more threedimensional and have added depth to hold more inside. In these cases we often use box csorners. In my patterns there are two different types of box corners: square edge box corners, as used in Melly’s Messenger and Luscious Layered Bag and cut out box corners, as used in Mobile Mummy Changing Bag and Wine and Dine Duo.
Square edge Box Corners
This form of box corners is the most common method used in bag patterns. Simply create your bag as usual, then add depth by sewing across the corners at different widths, depending on your desired depth.
1). Once you have sewn the bag front and back together you will have two squared off bottom corners, as shown.
2). Keeping the main bag inside out, open up the bag and re-fold it to position the side sewn seam on top of the bottom sewn seam, right sides together. This will create a triangle with its peak being the bottom corner of the bag, as shown.
3). Mark and then sew across the end of the triangle where it measures the specified width. For example, the following diagram demonstrates an instruction to mark and sew where the triangle measures 5cm (2in).
4). Cut the excess fabric at the triangle peak away, approximately 5mm (1⁄4in) outside of the sewn line.
Cut Out Box Corners
Cut-out box corners are ideal if you need to add something into the seam, such as with the Mobile Mummy Changing Bag. They also make it easier to achieve a very square bottom with less piecing and wastage, as with the Wine and Dine Duo.
1). Once you have sewn the bag front and back together along the side and bottom edges, you will have two remaining cut out bottom corners, as shown.
2). Keeping the main bag inside out, open up the bag and re-fold it to position the side sewn seam on top of the bottom sewn seam, right sides together. This will create a trapezoid with the top raw edges being the bottom cut out corner of the bag, as shown.
3). Making sure that the raw edges and seams meet evenly, simply sew across with a 5mm (1⁄4in) seam allowance to create your box corner.
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