1/2yardeach of 3 coordinating fabricsI chose canvas or duck to make it sturdy.
1/2yardof inner fabricAgain, I used a canvas-one of the ones from the outer part.
Optional: Interfacing if you want to make it stiff
Instructions
Select the fabric you want for the bottom layer of your bag. Fold the fabric in half and cut it so that the side edge angles outwards. (See image below.) The bottom straight edge should be 15 inches long total (so half that since you have your fabric folded) and the top 18″ total (so 9″ since it is folded.) Each layer should be about 5 1/2″ wide. Cut 2 of each of these strips.
Grab your next fabric and do the same thing, but the bottom of this one should match the top of your last one (keep angling outward like before).
Do this again with your third fabric. I didn’t angle quite as much outward on this one. The top of my bag (the top of the top strip) is about 21 inches across.
Now, sew each layer together by placing right sides together and sewing the straight edges.
It should look like this when finished.
Press your seams flat.
Do this with the other set of fabric that you have so that you have two sides of the bag.
Using your pieced together bag as a pattern, cut two pieces of the inner bag that match the outer bag you just created.
Place both sides of the bag together with right sides touching and sew down each side and across the bottom. Do this with both the outer and the inner bag pieces.
Now turn your inner bag right side out. Slide it down into the outer bag. Sew all the way around the top of the bag but leave several inches open to turn it right side out.
Reach into the bag and turn it right side out
Then tuck your inner part down into the outer and press it all smooth. To stitch around the top of the bag.
To create the straps cut two pieces that are 4 inches wide by 33 inches long.
Fold it so that right sides are together and stitch up the long side. Turn right side out. Press flat so that the seam is centered on the back.
Pin your straps onto either side of your bag. I placed mine so that the ends are about 10 inches apart and about 5 1/2 inches from the outer edge of the bag. Sew them in place. (I sewed a box with an x through the middle to keep them extra secure.)