Trolley suitcases

4 wheels

— four wheels located at the bottom of the suitcase; in a vertical position, it rests only on them, and the wheels themselves are usually made self-orienting. This option is more convenient than a two-wheeled one: the suitcase can be rolled both in an inclined position, in the “traditional” way, and vertically, with a minimum of effort. Among the disadvantages of this scheme, it is worth noting a slightly higher cost, as well as the fact that the wheels protrude noticeably from the end of the suitcase (although the latter is most often uncritical).