I don't bike, but I wanted backpack that would be waterproof so I wouldn't have to worry about my laptop and iPad getting wet and with this bag I don't. The construction is EXTREMELY sturdy and I love the protective crushproof compartment for my sunglasses.
My one complaint is that the tablet sleeve isn't big enough to fit my 12.9 inch iPad. I'd love to be able to get one that does.
It's very comfortable, as well.
There weren't a whole lot of reviews online for this, so I wanted to add mine. I highly recommend this bag even if you're not a biker.