I use Razer's Orochi V2 mouse when I'm traveling because it's feather light at only 2.2 ounces or 60 grams, so it's a breeze to travel with. And just as importantly, it's an ultra-responsive mouse that works with both Windows and Mac. This one has a bunch of macro keys on the left and underneath the scroll world too, plus you can choose to use it in Bluetooth or with a 2.4 gigahertz dongle for even faster responsiveness. I don't even need to charge it because it works with a single AA battery and lasts for months, which is great for travel.