This option has the bias inside and zíper to close it
What you will need
zipper 30cm or more
etaflon or insulshine
thread, pins, scissors
How to do this project
You can see how to stabilize and do the Hem on the other project of a lunch bag
To make the handles check the other lunch bag. The difference in here is that you will make to handles, one for each side.
Mark the middle of the sides and the body, place them together, with the outside together, make a straight stich to hold in place, start from the bottom, leave half centimeter in each corner and them sew the sides. You will need to push a little bit to help it, because the etaflon is a bit tricky to sew.
Check the other lunch bag to see how to put the bias
Turn to the other side and make stitches just on the top
Add a piece of fabric at the ends. After that place your supper so the seam will be at the same one that you have already done for the Hem. Make two parallel seams.