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40 Liter Backpacks
You don't want the cost and hassle of checking luggage. But you still want to max out your packing space.
The best size of backpack for the most packing space and still being allowed as a carry on is 40 liters.
A 40L backpack will measure about 22 x 14 x 8 inches (55 x 35 x 20 cm). At this size, you can use your backpack as a carry on even on budget airlines and when flying internationally. The US max is 45 liters, but you might have to check that bag when you travel abroad.
A 40L travel bag will fit a week's worth of clothes, toiletries, accessories, and a computer. That's everything you need for your next big trip.
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