If you're considering a bag with plenty of space, the Half Moon Bay Large would be a good option. It's the larger version of the original half moon bay laptop bag from Overland Equipment and can hold laptops up to 15.4 inches in size, and weighs a mere 1.5 pounds. The bag is a coffee-bean color with a golden yellow inner lining and has an adjustable shoulder strap.

The 14- by 16- by 5-inch laptop bag has a Velcro closure at the flap to keep your things secure. The bag is made of nylon and includes a padded slot for your laptop. There are two large deep pockets in the front of the bag for your accessories. For extra storage there's also a large mesh zippered pocket inside the bag and space in between for books and other large items.

I carried the Half Moon Bay Large bag around for a week. It kept my oversize laptop secure. I also carried my lunch, umbrella, iPod, keys, ID, and phone in the bag, and everything fit just fine.  

The bag does get heavier with the laptop inside which made it uncomfortable for me to carry with the strap provided; a padded strap would make it easier on the shoulders. And a handle would be helpful, so you'd have more than one way to carry it. Although there is an inside pocket for your stuff, I would like a specific pocket for smaller accessories; that would make it easier to find small items.

The Half Moon Bay Large can be yours for $80 from Overland Equipment.