Unless you really need the capacity of the Ostrich bag, I would look at a different one. The first issue that most people find with it is that for a frontbag (which should have easy access while riding), it opens the wrong way. That is, the flap opens from the front, making the rider have to reach over the bag to undo the latches and then the top flops back toward you. A frontbag should have an open-from-rear design for two reasons: Easy access during riding and the breeze of riding will keep the lid shut even if you don't latch it.
Secondly, it's a shallow design with a large footprint. If you have a tall handlebar setup this bag will likely sit well below the top of the bar; when you open the top flap, it will hit the bar and just stick up like a canvas wall.

If you're just using it to haul stuff, it's a great bag. If you're looking for a functional-while-riding frontbag, there are better options.