While no one questions the need to properly scan laptops when going through airport security, the requirement to remove them from their protective cases is a different story. "Naked" notebooks can easily get dropped, damaged, forgotten and even stolen outright. One study done for Dell estimated that about 12,000 laptops are lost in US airports every week -- a claim that has been challenged by the US Transportation Security Administration (TSA). Whatever the numbers are, you don't want your machine, with all its precious data, to become a statistic.

Happily, the TSA has recognized these issues, and began working with case manufacturers in March on a standard for checkpoint-friendly laptop bags that can pass through the security scanners without your having to remove your notebook.

Several cases meeting the spec have already hit the market, and many more are due soon. They have been allowed at checkpoints since late August.

So what makes a checkpoint-friendly laptop bag? The TSA has five official criteria:

• A designated laptop-only section.
• A laptop-only section that completely unfolds to lay flat on the X-ray conveyor belt.
• No metal snaps, zippers or buckles inside, underneath or on top of the laptop-only section.
• No pockets on the inside or outside of the laptop-only section.
• Nothing packed in the laptop-only section other than the computer itself.

To meet these requirements, case makers have come up with three basic bag designs: zippered clamshells that open flat with your laptop on one side and everything else on the other; double- or triple-compartment bags that unfold and lie flat like a garment bag, again with the laptop on one side; and simple notebook sleeves that either fit into a larger bag (in which case you'll need to take the sleeve out for scanning) or are carried alone. Many existing sleeves meet these criteria, as long as they don't have pockets or metal parts on the sides.

Here are eight of the latest full-featured TSA-approved cases with pockets and compartments that hold everything from your power adapter and accessories to a change of clothes. They'll help speed up the line and look good doing it.