For this project I used 3 inner tubes for the bag and one for the handle.
Step 1: Cut the Inner Tubes
Next cut the inner tube vertically (as shown below).
Most inner tubes you will find have a line pattern that you can follow for a straight cut.
Step 2: Cut Inner Tubes to the Same Length
Make sure to allow a little extra length for seam allowance.
Step 3: Sew the Inner tubes together
Sew each inner tube to the next one by one. I used 8 pieces.
~ I used the industrial walking foot sewing machine at the TechShop. This machine is perfect for this type of project since it can work with very thick materials. Theoretically this project can also be accomplished on a regular sewing machine.
Step 4: Sew Bag Sides Together and Bottom Closed
Next sew the bottom of the bag.
Now all three sides are closed as shown below.
Step 5: Clean up the edges
To create nice clean edges I cut off the excess using a paper cutter.
Step 6: Sew on Handle
To ensure the bag was extra durable I sewed the inner tube from the bottom corner to the top on each side.
Step 7: Cut off excess and Clean
Just clean up the edges and turn inside out.