I was gonna post my pics in a separate thread but I just found this one. Here's the one I made that's similar:
I got tired of lugging around a huge diaper bad and made this out of scraps, fleece (for padding) and older brother's old jeans. I was actually inspired to do this by another project I saw. Someone sells circular changing pads that fold up and have pockets also. Since I'm no expert I thought rectangular would be more achievable.