Roll-top or velcro closure, has a 15 inch laptop pocket inside. It's also on ebay. The price here reflects not having the ebay and paypal fees in the price. (it's $75 buy-it-now plus shipping on ebay.)

Backpack is in good condition, performs as promised on the tin. I used it for a while, then bought panniers, as I would rather load the bike than have a backpack on my back.