How to Sew a Boxed Bottom (Step by Step)
Give your bags a flat base and a neat, professional shape with this simple corner method.
By Hema · Updated October 2026
Mark and cut the corners
With the right sides together, mark a square at each bottom corner. For a 2″ deep bottom, mark a 1″ square.
Cut the squares out with sharp scissors or a rotary cutter, and keep the edges straight.
TIP
Press the seam open before you pinch the corner. Opening the seam makes the corners line up neatly.
COMMON MISTAKE
Cutting the squares different sizes. Measure each corner so both sides match.
MAKE IT
Harbor Crossbody Bag
A boxed-bottom crossbody bag with three pockets and an adjustable strap, in two sizes.
Sold separately at $7.99, or included in the Advanced Beginner Bundle
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