I have an old Timberland bag that works well for books + laptop. The only draw back is that just about any bag, backpacks in particular will have "slop" space in the pouch the laptop is in. That is one of the two reasons I ordered a sleeve as well. I can put the 700m in the sleeve, put the sleeved notebook in the pouch and reduce the "slop". Beyond that it's one more layer of protection for my laptop from [dropping, collisions, slamming books, (inseret reason here)].
I just spent a thousand bones on a nice new laptop.. I have no qualms about shelling out 30 bucks for a sleeve to protect it.
