Hard shell luggage tends to be easier to handle in airports or train stations since most have four wheels rather than two. Although it is possible to find soft luggage with four wheels, it is less common, whereas it is a standard feature for the hard shells. It makes maneuvering cases much easier and, since they tend to utilize 360 degree wheels, it’s harder to flip, drag, or lose the balance on heavy bags. This is a huge perk for those who need to get to multiple flights or have heavy items in their luggage. http://www.altabag.com/soft-luggage-set/