The term "1st checked bag free" is a marketing and policy benefit offered by certain airlines or through specific credit card memberships, meaning that the passenger does not have to pay the standard fee for their first piece of luggage checked into the aircraft's hold. Typically, major U.S. carriers (except Southwest, which offers two) charge between $30 and $40 for the first bag on domestic routes. If you have this benefit—often earned via a co-branded airline credit card, elite frequent flyer status, or by booking a specific fare class like Premium Economy—that fee is waived entirely. It is important to note that "free" still comes with weight and size restrictions; usually, the bag must weigh under 50 pounds (23 kg) and not exceed 62 linear inches. If the bag is overweight or if you check a second bag, you will still be subject to additional charges. This perk can save a family of four up to $240 on a round-trip journey, making it a highly valued travel benefit.