This ergonomic 50-liter carry-on converts to a backpack and has a detachable daypack for excursions. Of all the bags we tried, the simultaneously svelte and rugged Ozone, with its adjustable harness and its removable hip belt, was the most comfortable in its backpack incarnation. [$300; ospreypacks.com]
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Action-Packed Summer Trips
Race Dune Buggies, Explore Italy, Bike Yellowstone
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