I tend to carry a lot of gear. I'm on the go a lot and I like to travel. I used to commute far enough that it was easier to carry all I needed in one bag. A back pack was too big and an Ameribag wasn't big enough.
THULE makes a great Crossover Sling Pack. The design is attractive and sturdy and allows easy access to all contents while wearing it. The wide strap disperses weight over a larger area which is great if you pack heavy like I do. A zippered compartment in the strap lets you stow sunglasses, mp3 player or smaller cell phones for easy access. The back of the bag is soft material over padding to protect your Mac or laptop.
Two zipper pulls, allow you to adjust your entry point for easy accessibility. Inside the main compartment is a padded drop-in sleeve that will accommodate up to a 14 inch Macbook or laptop. The facing zippered interior pocket, which seems to be semi-waterproof, is roomy enough to hold a standard composition book with plenty of space left for magazines or other books. There's also a plastic latch clip sewn into the pocket for keys or jump drives.
The second large pocket is compartmentalized for smaller items with a double sided mesh pocket that keeps maps, electronics and writing utensils in view. A smaller zippered pocket is where I keep my keys, but you could easily keep cash or credit cards handy. The deep exterior pocket will hold even quart size water bottles when the bag is less full or reading materials.
Two sturdy grab and go handles allow it to be hung on most doorknobs. The textured zipper pulls are a sky blue which carries through on the interior pocket lining. The whole bag filled would fit in the overhead compartment of most commercial flights.
Being of smaller build, I find the bag covers a good bit of my upper body. I'm looking forward to traveling this summer and giving THULE Sling Pack a real work out.