i use a caselogic slip cover. it offers some padding. most of the time i dont have to take it out of the cover. i just place it in the basket (sometimes they are not available, so just on the rollers) and send it thru. every once in a while they make me take it out.
at mco a couple of weeks ago, they were searching everyone and my laptop got caught in a log jam at the end of the chute. as one bag after another piled up, all the laptops started skewing off the chute. none fell, but they were all hanging over.
i really think these security people have no idea of the cost or value of these items.
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f