Amazon.com: Swissgear Laptop Backpack Fits Most 17-Inch Laptops: Computers & Accessories
This is what I bought last year. My main criteria was to emulate the pocket and compartment layout of my outgoing backpack. I don't carry a laptop, but I could, as this has a pocket and a strap to secure the laptop in its compartment. This is a very sturdy, well-built bag and while water-resistant it's not waterproof. I find it comfortable, and my technique on my roadbike is to leave the straps long and let it rest on the small of my back. I hooked a D-Clip on the handle to hold my helmet when not riding. And as you can see in the photo there are two grommets or eyelets on each side. I ran a D-Clip through the pair on each side and this helps secure my backpack to the bungees when I carry it on the back rack of my other two bikes. I would agree that wearing a backpack would provide a more shock-free ride to a laptop than would carrying it on a back rack. However, one of my bikes has wire-frame Wald folding baskets on the side of the rear rack, and I have carried a laptop in a padded case in the basket and it did a nice job of cushioning shocks. I once carried my laptop and an old 4-track cassette recorder in the other basket and both still work!