Despite the strain it puts on the back, some people insist on the one-shoulder approach to carrying a backpack. Belkin's Sling Bag for Notebooks ($50 MSRP, available online for $35) offers a reasonable compromise: a lightweight, backpack-style bag with a single, cross-chest shoulder strap that distributes the bag's weight more evenly across the body. The bag's padded laptop sleeve fits 13- and 15-inch MacBook models, a removable pouch holds a few laptop accessories, and a pouch on the strap holds your mobile phone. The single-strap design is also convenient, letting you swing the entire bag around to the front for quick access to its contents, and, thanks to a quick-release buckle, making it easy to put the bag on and take it off. The bag's main drawback—or benefit, if you care about your back—is that it won't hold a lot of books and your laptop.