Lets make a tote bag from a woven plastic animal feed bag.
Look at your bag and the design. Decide what part you want to be premier or showing the most.
With a wet rag wipe the inside of the bag. They are a little bit greasy and you want to get rid of that. Plus they smell like cat food.
Cu off the top and bottom of the bag where the closure was/is.
Cut two strips from the top or bottom, where ever it will not interfere with the finished picture on the bag. These are going to be your straps.
Sew across the bottom of the bag on the outside. Then you will be turning it inside out and that way your seam wont show on the bottom or your bag.
Turn your bag inside out, pushing the corners out.
Sew along the bottom of the bag just above where you sewed on the right side of the bag.
Fold the bottom like this. Now sew straight across where my thumb is to make a sort of triangle.
Turn the bag right side out and push out the box corner you just made.
Now, take the strips you cut for your straps and fold the two sides to the middle and sew along the middle of the strip. I use a zig zag.
Now mark where you want to place your straps.
Place your strap by your marking.
Fold the bag down with the strap under the fold. This makes the strap folded double.
Pin along the top of the bag placing the straps where you want them. Pining through the straps is hard so use sturdy pins.