I'm looking for a relatively inexpensive backpack for travel. Currently I have a little Lowepro bag with room for my SLR with a small lens attached plus another lens in the front pouch. I have this bag inside a regular backpack. This is a little awkward and would like a one bag solution. The Canon 200EG seems like it would be perfect except that it looks like you have to unzip it all the way to take out the camera, which isn't optimum for security purposes (I would also have to cover that big Canon label/bullseye). I want something with a zipper at the top, not going down the sides of the bag, so I can just pull the camera out without opening the rest of the backpack. I also need the front flap to put my documents and books. Any suggestions?