North Face Laptop

I'll get a new IBM Thinkpad X61 for school soon and I need something to wear to school in.

I read many reviews but I still can not decide between a laptop backpack or just buy a sleeve and using it with my old backpack. My two options are:

1.) Backpack North Face
http://www.ebags.com/the_north_face/surg ...

Best back there, clean look with slot for laptop.

2.) Boo Powersleeve XS
http://booqbags.com/s.nl/it.A/id.100/.f? ...

Small, tight-fitting sleeves that I can put in my backpack or carry out its own past.

What are your experiences?? Which do you prefer??

I think you should choose the latter because it is small and handy that I have is very good, unless you want the first who will know that you have a laptop in it!