I personally use a stolen McDonalds tray to keep those potentially exploding laptop batteries breathing and off my crotch, but these'll do. If your notebook's bottom is smooth, like an Apple (not one of those gnarly ThinkPad booties) you can suction cup them on, and compute with maximum clearance and ventilation between you and your lapbomb. $13 bucks a set. (McDonalds Tray, free with Happy Meal.)
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