The Dad Bag
Ruggedness, reliability and resilience are not only qualities that a Dad should possess but his bag as well. Now you could drop a pretty penny on a designer "Dad Bag" complete with a matching changing pad and a little piece of your manhood or you could head down to your local Army/Navy store and pick up a surplus bag. I love taking items that have been tested and re-appropriating them into a different context and this is exactly what you can do in a store like this.
I found this U.S. Army issued Flyer's Helmet Bag for $15. The waterproof materials along with the two interior and exterior pockets makes this bag the ideal candidate for a perfect dad bag. And when your little one no longer requires a traveling convoy on every excursion out the house, the Helmet Bag can be used as a laptop carry or a camera bag. If you don't have an Army/Navy store near by, you can buy a new one at Flight Helmet for $24.