Many times, I just need a small container for my phone and my ID, and it has to be able to go through a little wear and tear. Looking through the remnants section of my local fabric store, I found some teal poly vinyl so I decided to make a waterproof pouch for my cell phone and the few cards I usually carry. I first made an unlined version (http://www.instructables.com/id/Cell-Phone-Pouch/), and then I decided to take it up a notch with a second version and added some medium weight cotton lining.
I hope you find this helpful! All of this tutorial can be made on a standard sewing machine, but for ease, I would suggest making this version on a walking foot industrial sewing machine.
I made this at TechShop!
TechShop Pittsburgh: http://www.techshop.ws/pittsburgh.html
TechShop homepage: http://www.techshop.ws/