— A universal travel adapter that converts electric current around the world. The travel store Flight 001 has a "5-in-1" color-coded adapter, $35.
— Portable chargers to keep devices running on the road. Anker's PowerCore 26800, $48, can charge an iPhone more than six times. For hikers and beach bums, Anker's PowerPort Solar Lite, $51, was deemed the best solar charger by The New York Times' Wirecutter product-testing company.
— The Tile, $35, to keep track of belongings. Attach the Tile to an object like keys or bags, or tuck it inside a passport case or wallet, and you can locate the item with Bluetooth technology. For outdoor gear, try Tile Sport.
— Tiny Bluetooth speakers, like the $28 Oontz, to fill a hotel room or vacation rental with music.
— Power strip or cube tap (a cube-shaped adapter with multiple outlets) to charge multiple devices in hotel rooms and airports.
— Headlamp for hiking, reading and crafting. Or the mini Lumio lamp and battery pack, which opens and closes like a book, $150.