What is a good/affordable Laptop Backpack that I can use to travel with?

I am going on a 3 week backpacking tour of Europe next month. I am also going back to school as soon as I come back, and I need a backpack to hold my 17" laptop. I wanted to buy just one backpack instead of two to save money. Northdace and Jansport are great backpacks, but my budget is $60. I need the laptop holder, at least two separate compartments and a water bottle holder. Thanks for your help.

I just ran a search on EBAY and found that there are quite a few of them available within your budget. Heres the link:
http://search-desc.ebay.com/search/search.dll?sofocus=unknown&sbrftog=1&catref=C6&fro m=R10&satitle=water+bottle+17&sacat=31520%26catref %3DC6&fts=2&sargn=-1%26saslc%3D2&sadis=200&fpos=11201&ftrt=1&ftrv=1&s aprclo=&saprchi=&fsop=1%26fsoo%3D1&fgtp=
All of them hold a 17" LAPTOP AND A WATER BOTTLE.
tHANKS.