A flexible protective insert for lining a suitcase of soft-sided construction, having elongate flexible ties for securing clothing and the like within the protective insert and having elongate flexible support ties for securing the protective insert within such a suitcase. The insert is preferably constructed of flexible fabric and is light in weight, so that it does not significantly add to the weight of the suitcase nor to the bulk of articles carried within the suitcase. The protective insert protects clothing packed therein from being soiled by articles such as shoes carried within the suitcase, prevents clothing contained therein from moving about within a partially empty suitcase, and thereby being wrinkled, and permits articles contained in the insert to be placed on top of other loosely packed articles within a soft-sided suitcase, giving ready access to either the articles in the insert or to the loosely packed articles.