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Travelers didn’t have to consider how to pack a backpack and skip the baggage fees 20 years ago. Packing for a flight was a lot simpler. After all, just by purchasing an airline ticket, you’d have the right to a checked bag and a couple carry-ons. But things have long since changed. First came the checked bag fees — airlines began adding them in the mid-to-late 2000s as a way to offset rising…