This DIY byDrink and Sew Thingsis a game-changer for organizing your car.
you will want two outer pieces and two inner pieces.
Cut a 3 inches wide, 16 inches long strip of fabric to use for your strap.

Drink and Sew Things via YouTube video.
Step Two
You will be making two separate bags.
One is a liner and one is going to be the outside of your bag.

Allow a 1/4 inch seam allowance when sewing your bags.
If you want a boxed bottom this is where you will box the fabric out.
Step Four
Take the lining bag and turn it inside out.

Place the lining bag inside your outside bag.
The outside bag should be turned inside out.
Place your strap in-between the outer bag and the lining, then clip around the edges of the bags.
Step Five
Remove the arm of your sewing machine.
Sew where you just clipped with a 1/4 inch seam allowance.
Be sure to leave a hole so you’ve got the option to turn the bag right-side out.
Once you are done, push the lining fabric into the bag fabric and topstitch the hole together.