Futurelooks reviews a tiny Bluetooth mouse, not much bigger than the 2 AA batteries that it runs on.  It is easy to recharge, and will fit in even the most cramped laptop case.  Mind you, you might want to keep it tied to something, as it will be very easy to lose.
“Another wireless mouse? The Bluetake BT500+ mouse is not just another wireless mouse. It is probably the world’s smallest wireless bluetooth mouse. It’s so small, they call it a Super Mini Mouse and we’ve reviewed it right here.”

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