The solution was the Indygo Junction's Manhattan Messenger bag pattern and some recycled Bottletones T-shirts! This bag is the PERFECT size for carrying diaper changing supplies, snacks, a couple of sippy-cups, and a few of Momma's things as well.
The directions for this pattern were a little funky and I opted not to add any of the extra pockets or the hook and loop tape. I like easy access to my bag - no fooling with closures, so I added stacks of buttons along the bottom edge of the flap to weight the edge and keep it closed.
I used one black printed pocket t-shirt for the outside of the bag, and was able to keep the pocket intact as part of the front. It is perfect for holding my cell phone! One white printed t-shirt became the lining, and the inside flap was cut so the design shows when the bag is opened.
The large black and white gingham check is a new portable changing pad I made from some cotton, batting, and vinyl. I'm suprised how well it turned out because this was one of those hurry-hurry projects. (Okay, except for the crappy job I did sewing on the bias tape - that's not so great.) But, since it was so easy, I want to make another one and I'm thinking about sharing the instructions with you! Would you like an easy baby butt-pad tutorial?