Southwest sells bags for $17 each. These aren't required, it's up to you if it is helpful to make sure things don't get scuffed, or if you find cheaper bags somewhere else that's okay too. If you might be flying 5-10 times or more, the cost of the bag may be reasonable to reduce wear from handling. From my perspective, for any one trip you aren't expecting much to happen to your item. But now having used our blue bags 30+ times, the bags sure are beat up...glad that cumulative punishment (even if a very little each time) wasn't onto our stroller.
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