We load the Black Diamond Street Creek 24L Backpack for commutes where the laptop has to arrive in one piece. A dedicated 15-inch sleeve on the outside holds it in a floating compartment, and a padded bottom panel adds protection from below. What Our Gearhead(R) Experts Are Saying:"When the sky turns on the ride home, I unzip the hidden pocket and pull the rain cover over the pack before the drops start. It lives inside the pack, so it rides along on every commute, not just the ones I planned for."