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As airline baggage fees climb, a once-overlooked travel trick is gaining traction. Here’s when it makes sense and how to do it right.

Southwest Airlines’ move to charge $35 for the first checked bag and $45 for the second ends its popular “bags fly free” policy and leaves no major U.S. airline offering free checked luggage. According to MarketWatch, travelers are now searching for ways to avoid escalating baggage fees. Once considered extravagant, shipping luggage is gaining traction as a practical…