Lowepro Vertex, or natur etreker?

I must get my self a new bag. The Computrekker I have at the moment is to small. Checked at the Naturetrekker AND Vertex 200 and 300.

Here are my question. Do the Vertex modell store small things, like the computrekker do great in the outer compartment? I dont see any compartment on the Vertex where I can store like food box and water bottle. and other stuff.

Help.