It's not much smaller. Check the dimensions on their site between the two. One inch narrower at the most, and the black one you linked to is easier to get in and out of if you put other things in there too.ugh... if i need to. give this one to my sister and see if i can find the smaller one.
Just get a fanny pack. They're cool, we all know it. I use one too as I hate loading my pockets. My neighbor is the only one to have commented and I asked him if he had a problem with it... he said No really fast, but my tone may have implied he'd be spitting his teeth out if he said otherwise.