This is written by Christine Down. Christine sells instantly downloadable bag making patterns at https://www.sewlush.org/ View her other bag making tutorials by clicking on the ‘bag making’ tag on our techniques page.
Zip closure on a bag is probably my favourite. It gives a nice, neat appearance, it’s also secure and you can use it in a few different ways. Probably the easiest way is to use an open end zip (like the sort you have on zipped tops and cardigans). In this bag making guide I show you 3 different ways to sew a zipper closure on a bag.
Zip installation technique 1
The zip panels should be shorter than the top of the bag. I make mine approximately 5cms at each end shorter than the width at the top of the bag. (10cms altogether) The zip panels plus the zip should be slightly narrower than the depth of the bag. Cut four identically sized zip panels in either all main fabric or main fabric and lining. (Allow 1cm seam allowance all the way round each panel). You need two panels with a front and a back. Reinforce all the zip panels with firm iron-in interfacing.
Turn the seam allowance under all round and iron. Stitch around three sides and secure the zip in the inside seam between the main fabric and the lining. Leave 1cm free at the top of each short end so the zip will fit easily. If you want you can match the zip length to the panel but I like to leave the zip a bit longer as it makes doing it up easier.
Stitch around the rest of the zip panel encasing the zip as you go. Repeat for the other side.
Clip one side of the panel into the bag body equidistant from both ends. This is when those wonderclips are really useful!
Stitch down both sides of the panel to secure the zip panel into the bag.
Zipper installation technique 2
The second method will be familiar to those of you who have made zipped pouches. The zip is sewn directly into the top of bag and the bag and the lining are treated as a single item until turned out.
To make the end tabs of the zip, fold the piece of fabric in half length-wise. Press. Then open and fold the raw edges towards the centre crease and press again. Placed your zip end in the folded tab and pin.
Stitch across the tab end to secure, repeat for other end. The length of the zip with the tabs should be just slightly shorter than the bag top. Now you are going to make a zip “sandwich”. Placed the lining fabric right side up and centre the zip face up. Place the main fabric right side down on top of your lining fabric and zip ensuring the edges line up.
Secure with pins or clips, the zip should be undone so the zip pull is on the right hand side as you look at the top. Sew along the top edge. Stop just before you reach the zip pull and manoeuvre the zip pull backwards to where you have already stitched. Finish sewing the zip.
Place the other piece of lining fabric right side up and centre the zipper face up with the pull zip on the left side this time. Put the other main fabric with wrong side facing up on top of the zipper. Ensure the edges are in line and pin in place. Stitch as before.
Turn the bag pieces so that the main fabric for both sides of the zip is on top and the two lining pieces are on the bottom wrong sides together. You should be able to see the tab ends.
Press the zip section flat and topstitch down both sides of zip.
To sew the next step of the bag fold the bag pieces so that the main fabric is face to face and the lining is face to face. You should have a long piece with the wrong sides uppermost and with the right sides together inside.
OPEN THE ZIP. You will eventually turn your bag out through the zip so make sure it is open. Stitch around the entire bag leaving a gap in the bottom of the lining. Turn out through the gap and then through the zip. (You’ll see how to do this once you’ve stitched the bag and turned out through the gap. The lining obviously goes inside the zip).
Zip Installation Technique 3
This method is used on bags with a curved shape, and although you can use one zip, two zips make a neat finish and easy access to you bag.
The curved section the zips are set into is a gusset. The gusset will be two identical main pieces and two lining pieces. Place the main gusset pieces together and stitch together for 12cms from each end using a 1cm seam. Press the rest of the gusset 1cm on both sides right along the length of piece. Use some glue to hold the zips in place and then stitch along both sides approximately 0.5cm from the teeth ensuring the zips meet in the middle.
Cut the lining gusset to match. Apply Thermolam to the wrong side with spray baste (505) and stitch the ends as before. Fold over the remainder of the centre seams and press.
Lay the pieces wrong sides together and topstitch over the zips again so that the lining is in place but not near the zip teeth.
The gusset is then sewn into the rest of the bag.