just finished... my own bag. Small, lightweight and perfect to keep keys, cell phone, and driving license. I was looking for a very small bag with a long over the shoulder strap and since I couldn't find it anywhere, I made it myself. I tested at the playground, where I have to run after kids, and jump and whatever else I need to do to keep up with them, and I am happy to say - my bag passed the test with flying colors. 
What is even better I got my first order from my friend...