I have a Timbuk2 laptop backpack that I love for traveling, but it looks like they don't make this particular model anymore. I can fit my laptop in the sleeve (netbook these days), clothes in the same main compartment, toiletries on top or in the small front compartment (or snacks). It has two compartments on either side of the bag that I can fit stuff in; they have little pockets built in. One of the side compartments has a pocket designed to fit a 32 oz. Nalgene, or my coffee cup, which I always liked for school. The other compartment has pockets designed to hold pencils/pens and my cell phone, as well as two smaller pockets. One I use to hold medications I need and the other is for female necessities. With the way the bag is organized, I can pretty much fit anything and everything I need in it. However, it is not compressible--and I wouldn't advise a bag with compression if you are only using a laptop sleeve. Compressing your bag down with expensive electronics inside it just seems like a really bad idea.
Have you looked around at other retail outlets for Timbuk2 bags on closeout? REI's outlet has some of the older bags that have more pockets. I guarantee that inside those pockets, there are some knacky organizational pockets. My backpack is actually what led me to then buy a Timbuk2 purse
because it's so well designed.
I also found this North Face pack while poking around on REI's outlet site:
The North Face Base Camp Compressor Daypack - 2010 Closeout at REI-OUTLET.com It is a compressible pack with a laptop sleeve.