I in no way need another bag. I have multiple backpacks provided by employers on top of the various ones purchased myself. In addition I have multiple bags that come from conferences. I have so many that I have taken to setting different ones up for different contexts. I have the backpack I take for work and work travel; I have the backpack for personal travel; I have the backpack for taking the child out to events; I have the messenger bag I like to take when I am riding my bike.
That said, despite my complete lack of need for such a thing, I find this Think Geek bag purpose built for taking to SF and comic conventions to be crazy sweet. The whole reason why I mix and match my bags is that none of them are perfect. Some have the water bottle mesh side pockets, some have the laptop compartments and the inner pocket with lots of pen and pencil slots. I love the idea of taking the needs of a specific event and crafting a bag to address it. I have probably taken all of my backpacks to some convention or another and none are perfect. And it is only $30 so not even expensive.
But I don’t need it. Really I don’t. Really. I don’t. Need it.