News Detail

Home / News / Mylar Bags / how to sew a bag with a flat bottom

how to sew a bag with a flat bottom

Views: 0     Author: Site Editor     Publish Time: 2025-05-08      Origin: Site


Sewing a bag with a flat bottom is a rewarding project that combines functionality and style. Whether you're looking for a new tote for groceries, a stylish handbag, or a unique storage solution, a flat - bottom bag can fit the bill. This step - by - step guide will walk you through the process, from gathering materials to the final stitches.


Materials You'll Need


  1. Fabric: Choose a sturdy fabric suitable for your bag's intended use. For a heavy - duty tote, canvas or duck cloth works well. Quilting cotton is great for lighter - weight bags or if you want to add decorative elements like embroidery. You'll need enough fabric to cut the main body pieces, sides, bottom, and handles (if applicable). As a rough estimate, for a medium - sized tote bag, you might need around 1 - 1.5 yards of fabric.

  2. Thread: Select a thread that matches the color and weight of your fabric. A strong, all - purpose thread is a good choice for most projects.

  3. Sewing Machine: While some parts of the bag can be sewn by hand, using a sewing machine will speed up the process and result in neater stitches. Make sure your machine is threaded correctly and has the appropriate needle for your fabric.

  4. Scissors: A pair of sharp fabric scissors for cutting the fabric and thread.

  5. Pins: To hold the fabric pieces in place while sewing.

  6. Ruler or Measuring Tape: For accurate measurements.

  7. Iron and Ironing Board: To press the fabric and seams, which helps in achieving a professional finish.

  8. Optional: Interfacing - If you want to add structure to your bag, fusible interfacing can be used. Cut it to the same size as the main fabric pieces and iron it onto the wrong side of the fabric before sewing.


flat bottom pouch


Step - by - Step Sewing Process


Step 1: Cut the Fabric

  1. Main Body Pieces: Cut two rectangular pieces for the front and back of the bag. The size depends on the desired size of your bag. For example, for a medium - sized tote, you could cut pieces that are 16 inches wide by 18 inches tall.

  2. Sides: Cut two rectangular pieces for the sides of the bag. These should be wide enough to create the desired width for the flat bottom. A common width is 4 - 6 inches. The height of the side pieces should match the height of the main body pieces. So, if your main body pieces are 18 inches tall, your side pieces could be 4 inches wide by 18 inches tall.

  3. Bottom: Cut one rectangular piece for the bottom of the bag. The width should be the same as the width of the side pieces, and the length should be the width of the main body pieces. For our example, the bottom piece would be 4 inches wide by 16 inches long.

  4. Handles (if making your own): Cut two strips of fabric for the handles. The width and length can vary based on your preference. A typical width for a tote bag handle is 2 - 3 inches, and a length of 20 - 30 inches is common. For example, you could cut handle strips that are 2.5 inches wide by 24 inches long.

Step 2: Sew the Sides of the Main Body

  1. Place the two main body pieces right sides together.

  2. Pin along the sides, making sure the edges are aligned.

  3. Using a 1/2 - inch seam allowance, sew down the sides of the bag. Backstitch at the beginning and end of the seam to reinforce it. This creates the basic shape of the bag's body.

Step 3: Create the Flat Bottom

  1. Method 1: Triangular Fold

    • With the bag still inside - out, flatten one of the bottom corners so that the side seam and the bottom seam line up. This forms a triangle.

    • Measure up a certain distance from the point where the seams meet. For a medium - sized bag, 1 - 2 inches is a good starting point. Mark this measurement with a pin or a fabric marker.

    • Sew across the triangle at the marked line. Trim the excess fabric, leaving about a 1/4 - inch seam allowance.

    • Repeat this process on the other bottom corner.

  2. Method 2: Square Cut - out

    • On each bottom corner of the bag (while it's still inside - out), draw a square. The size of the square depends on the width you want for the flat bottom. For a medium - sized bag, a 1 - 1.5 - inch square is suitable.

    • Cut out the squares.

    • Flatten the cut - out corners so that the side seams and the bottom seams line up. Sew across the opening of each flattened corner with a 1/4 - inch seam allowance.

Step 4: Attach the Sides and Bottom

  1. Take one of the side pieces and place it right sides together with the side of the bag. Pin it in place, aligning the top and bottom edges.

  2. Sew along the side with a 1/2 - inch seam allowance. Repeat this process for the other side piece.

  3. Now, take the bottom piece and place it right sides together with the bottom of the bag, aligning it with the sides. Pin it all around and sew with a 1/2 - inch seam allowance.

Step 5: Make and Attach the Handles (if applicable)

  1. Making the Handles

    • Fold each handle strip in half lengthwise, wrong sides together. Press the fold with an iron.

    • Open the folded strip and fold each long edge in towards the center crease. Press again.

    • Fold the strip in half once more so that the raw edges are hidden inside. Press and then sew along both long sides of the handle using a straight stitch.

  2. Attaching the Handles

    • Decide where you want to attach the handles on the bag. Usually, they are placed 2 - 3 inches from the top edges and centered on the sides.

    • Place the ends of the handle at the marked positions, with the raw edges of the handle aligning with the raw edges of the bag. Pin the handles in place.

    • Sew around the perimeter of the handle ends to attach them firmly to the bag. You can sew a square or a rectangle around the handle attachment point and then sew an "X" inside it for extra strength.


square bottom tote bag


Step 6: Finish the Bag

  1. Turn the bag right - side out. Check the seams to make sure they are secure and the bag is shaped correctly.

  2. If you want to add a lining to the bag, follow these steps:

    1. Cut two pieces of lining fabric the same size as the main body pieces, one piece for the bottom the same size as the outer bottom piece, and two pieces for the sides the same size as the outer side pieces.

    2. Sew the sides of the lining pieces together in the same way as the outer bag.

    3. Create the flat bottom for the lining using the same method as for the outer bag.

    4. Place the lining inside the outer bag, right sides together. Align the tops of the two bags.

    5. Sew around the top of the bag, leaving a 3 - 4 - inch opening. This opening will be used to turn the bag right - side out.

    6. Reach through the opening, grab the outer bag, and pull it through the opening in the lining. This will turn the bag right - side out with the lining inside.

    7. Push the lining down into the outer bag and make sure it's evenly distributed.

    8. Fold the raw edges of the opening in the lining towards the inside and press. Sew the opening closed using a ladder stitch or a topstitch.

  3. You can also add additional embellishments like buttons, patches, or embroidery to personalize your bag.


Now you have a beautiful, functional bag with a flat bottom that you can use for various purposes. With a little practice, you can experiment with different fabrics, colors, and sizes to create unique bags that suit your style and needs.
large flat bottom tote bag
bottom gusset bag
‌Eco-Friendly Compostable Flat Bottom Pouches‌


NewRound Packaging

 

One-stop flexible packaging solution

 

Telephone

+86-18923062980

Address

#205-207 Songyuan Bldg, No. 173 DapengRd, Shaping Jiangmen, Guangdong, China

Products

Quick Links

Contact

Help

Copyright © 2023 NewRound Packaging Technology Co., Ltd. All Rights Reserved. Sitemap