Wall outlets are in short supply on planes, trains, and buses — and in many airports and hotels — so packing a portable power strip is a must for frequent travelers.After researching dozens of models and testing the top contenders, we’ve concluded that the best power strip for North American travel is the Tripp Lite Protect It 3-Outlet Travel-Size Surge Protector (TRAVELER3USB).It has three outlets and two USB-A charging ports with adequate spacing for bulkier plugs, and it’s smaller and lighter than any other travel model we’ve tested.