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Bike Bag Project

Waterproof handlebar bike bag sewing project.

Our bike bag project uses waterproof fabric so it can handle showers when you are out on your bike. Big enough to fit a drink and snack in you can use it as a lunch bag, or to carry any supplies you want to take with you, plus it’s detachable. We added Prym reflective strips on the side to help make you more visible to traffic in low light conditions.



–        Half a metre of fabric for the exterior. We used a print called geometric watercolour galaxy squares and triangles from Fashion Formula printed on a waterproof Tentex base. They are fabric printers so can print your chosen design onto a wide range of over 80 different fabrics.

–        A fat quarter of co-ordinating fabric for the lining. I just used a quilting cotton I found in my stash.

–        10.5 inches of 20mm Prym hook and loop tape (cut into 1 x 7.5 inches, and 2 x 1.5 inches)

–        1 pack of Prym 20mm reflective tape

–        Half a metre of Vlieseline Stylevil bag foam

Useful to have – A Prym chalk pen and a Prym point turner.

Waterproof fabric for making a bicycle bag

Cutting instructions

Cut 2 pieces 9 by 7 inches (front and back panels) from the exterior fabric, lining fabric and Styelvil

Cut 2 pieces 4 by 7 inches (side panels) from exterior fabric, lining fabric and Stylevil

Cut 1 piece 9 by 4 inches (base) from exterior fabric, lining fabric and Stylevil

Cut 1 piece 9 by 9 inches (top flap) from exterior fabric, lining fabric and Stylevil

Cut 2 pieces 6 by 3 inches from just the exterior fabric (straps)

Note – You might want to measure the front bar of your bike (where the handle bars join into the body of the bike) to check the straps will fit and to see how far apart you need to space the straps when attaching them to the bike as I’m not sure if all bikes are the same size.



Press the fabrics (I used a pressing cloth on the waterproof fabric).

Baste the Stylevil pieces to the exterior fabrics sewing around the edges within the quarter an inch seam allowance (so around 1/8 of an inch from the edge).


Seam allowance – quarter an inch


Sewing instructions

Please read right through before you start.

How to sew a handlebar bag for your bike

Sewing the lining

Place a side panel on top of the front panel, right sides together aligning the 7 inch edges and sew from the top, stopping quarter an inch from the bottom.

Repeat for the other side panel, and to attach the back panel to the sides, each time stopping quarter an inch from the bottom. The quarter an inch gap makes it easier to attach the base.

Sewing a lined waterproof bag for a bike

Pin or wonder clip the base panel into place, and sew along one edge from corner to corner. Tie off your stitching. Take the fabric from under the needle and re-position for the next edge. Repeat for all 4 edges but make sure you leave a 5 inch gap in the lining on one of the long edges (this will allow you to turn the bag through later).

Sewing Prym reflective strips to a bag

Reflective strips

Stick a reflective strip along the width of each side panel, position them wherever you think they look best. You could add a couple each side if you wish. They are self-adhesive, but I chose to stitch them too to make then extra secure.

Sewing with Tentex fabric

Making the straps

Fold your strips in half height wise, then press. Open them up and fold the long edges into the centre fold you just created. Press into place. Fold around ¼ an inch of fabric in from either end and press into place. Then fold the strap in half height wise again so the raw edges on the long sides are tucked in the centre, press again.

Sew right around the outside of each strap.

Cut 2 x 1.5 inch strips from your hook and loop tape. Sew the hook strip to front left of each strap.  Sew the loop tape on the opposite end of the strap, but on the back of the strap.

Waterproof bag for your bike sewing project

Attaching the straps

Take the back exterior panel of your bag. Using your chalk pen make a mark 2 inches up from the bottom centre of the back panel, then make another mark 1 inch higher. These marks are where you will place the bottom edge of your straps.

Fold the straps to find the centres, then line the centre up with the marks you just made. Sew them into place to attach the centre of the straps. Sew across the bottom centre of the strap quarter an inch, then up to the top, across quarter an inch to directly above where you started, then back down to your start point. Repeat 2-3 times to make sure your straps are well secured.

Bag fastening technique - velcro

Hook and loop fastening

On the front panel of your bag mark a 7.5 inch line, 2 inches down from the top edge and centred on the panel.  Sew one side of your hook and loop tape on here using the chalk line as a guide for placing the bottom edge of the tape.

DIY Handlebar bike bag

Complete bag exterior

Assemble the bag exterior as you did the lining piece, but you do not need to leave a gap in the base. However, make sure you leave the ¼ an inch gap at the bottom of each seam to make it easier to attach the base.

Turn the bag exterior right sides out, use the Prym corner and edge turner to poke out the corners. Place the bag exterior inside the bag lining, so the right sides of the fabrics are touching. Line up the top edges, use clips to hold them in place and sew right around the top.

Use the gap in the lining to turn the bag through. Sew the gap closed afterwards either by machine or by hand. Top stitch around the top edge to hold the lining fabric on the inside. 

Handlebar bag sewing tutorial

Bag flap

Mark a line centred and 1.5 inches from the bottom on the right side of your flap lining fabric. Use this line to sew the other side of your hook and loop tape in place, aligning the bottom edge with the line.

Put the flap exterior and lining fabrics right sides together. Sew around the edge leaving a 4 inch gap at the end where you don’t have hook and loop tape for turning through.

Free handlebar bike pattern

Trim the corners, then turn through. Use the Prym corner and edge turner to poke out the corners. Press, then top stitch right around the whole flap, close to the edge so you close the turning gap as you go. If your lining fabric is visible on the front finger press it to the back as you top stitch.

Line up the hook and loop tape on both the flap and the front of the bag. Stick the 2 together. Pull the flap over the top of the bag to the rear, mark a line just below the bottom edge so you know where you want to attach the flap.

Free bike handlebar bag pattern

Unstick the hook and loop tape, line the rear of the flap up with the line you just marked and sew it into place. Don’t pin it if you are using waterproof fabric as the pins will leave marks, just hold it in place as you stitch or use a glue stick to temporarily baste it in place.

Now your bag is finished! Attach it to your bike, fill with supplies and enjoy your bike ride!

If you like this bike bag project please feel free to share the link on social media or send us photos of your finished bag. 

How to sew waterproof handlebar bag for your bike

This project was written by Fiona Pullen from The Sewing Directory.