Like many take-anywhere WiFi networks, the 2.1-ounce Karma WiFi provides a fast pay-as-you-use-it 4G hookup wherever you are. Unlike others, the device lets you earn free data every time a fellow traveler joins your mini network. [From $99; yourkarma.com]
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Action-Packed Summer Trips
Race Dune Buggies, Explore Italy, Bike Yellowstone
Plus: Fighting Poachers and Oil Companies in Congo
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Nick Offerman's Life Advice
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