In general, most of the maxpedition style knock off gear is pretty poorly and cheaply made. Plus its far heavier than it needs to be. I think you would be better off looking at some of the small-medium camelbak bags. They can be had with molle and camo if you want. they are generally pretty well built and reasonably durable. a camelbak will also ride much better. There are other brands as well in that category to look at as well. Also some of the larger packs have a vent panel built into the staps to hold the pack body a way from you a bit. Might be handy out there in the desert.
I've found that in general running packs are thought out, and designed, where as "tactical" packs are rather poor in the ergonomics department. for example, that pack is only 18 inches high, but 12 deep, that means that if you fill it, a lot of the weight is going to be a long way from your back/center of gravity. another thought is that I fell like that pack might be a bit small for a planned overnight (for an unplanned one, I'm sure you could have enough stuff in there to survive, maybe not so comfortably)
If budget is a concern, try to showroom some bags and see how they feel, then hit the jungle-river store or popular auction site. With a lot of the smaller bags, (anything less than 50L) you get a lot less adjustment, so you will want to know that it fits your body shape. (lots of manufactures design to the average, unfortunately, that guy doesn't really exist)