There’s good news for travelers. The Transportation Security Administration will soon allow those with laptops to leave them inside their “checkpoint friendly” cases. In order to qualify, the cover must have a designated laptop-only section that would lie flat when it rolls through the X-ray machine. It cannot have metal zippers, snaps, buckles, or inner pockets. The new rule will take effect Aug. 16. Already approved are bags from Mobile Edge, Tagus, and the Skooba Design Checkthrough that will become available in the next few weeks.