live out of a/(one's) suitcase
To only have the clothes and personal items in one's suitcase(s) available to one. I'm on the road for three months at a time for work, so I've gotten pretty used to living out of a suitcase. Sarah's been living out of her suitcases in her brother's apartment ever since getting evicted from her house.
live out of a suitcase
Fig. to stay very briefly in several places, never unpacking one's luggage. I hate living out of a suitcase. For my next vacation, I want to go to just one place and stay there the whole time.
live out of a suitcase
live or stay somewhere on a temporary basis and with only a limited selection of your belongings, typically because your occupation requires a great deal of travelling.