The Flash has an internal pocket system - one big sleeve against your back big enough for a hydration bladder, and on the "front" of that sleeve there are a number of pockets. They're not the easiest to access, especially when you've got other stuff in the bag, but they hold things in place. I have a pump, multitool, spare tube, cell phone, wallet and keys all stowed in the various inside pockets for my commute, with clothes and lunch in the main compartment.

I do wish the pack had a few external pockets but like I said, for $30 I'm pretty happy.