Depending on the airline, baggage fees, etc., people travel with a wide variety of amounts and sizes of luggage. Me, personally, I usually fly southwest which allows me to take three bags, and usually use all three bags. Even if it is a short trip, we use one for food/snacks. Many people prefer to travel lighter and may only be able to travel with one bag per airline guidelines. Anyway, as a runner participating in the marathon last weekend, it is commonly spread advice to always fly with your running gear in case the airline loses your bag, you'll still have your gear and not forced to try and wear new shoes and clothes for a race. So, I did that...packed all my race stuff in my carry on. Good thing too, because shortly after arrival and lunch, as I am boarding the marathon expo bus with a crying three year old I got a call from Southwest that my garment bag fell from the luggage truck and was drug down the tarmac ruining the bag and all of it's contents. Now, before this turns into a "cry me a river" type of post, this is how it may relate to you. The bag that was ruined wasn't the suitcase with all of my necessities/things I need and HAVE to replace (jeans, shorts, underwear, etc.), it was my garment bag, with all of my nice clothes. Dress shirts, sweaters, some irreplaceable Ironman Finisher clothing, etc. I started to ponder which bag I would have preferred to lose if I had to choose. The method that would probably work best is packing my suitcases like I invest, very diversified. Pack some of everyones items in different suitcases and mix it up so if one suitcase is destroyed, or lost forever, the hit is "minimal" to one single person and one specific type of clothing. I would have much preferred lose one sweater, one pair of jeans and a few polos than the amount I lost.