I found a tutorial for a nice big tote here (though note that the measurement for the handles is 24" each, not the 14" listed).
How to make straps out of thin, flimsy cotton fabric? Crease it in half..
Sandwich pocket lining, interfacing, and outer layer together. Using bias tape for the pocket piece, sew one side down..
Sew the pocket to another sandwich of outer layer and interfacing. A line down the middle will create a pocket division.
|Interfacing and outer layer|
Turn the main bag inside out, and sandwich it inside the lining. Pin your straps to the main bag. Right sides should face each other. Sew around the top.