The phrase "new suitcase" refers to a bag or container that is recently purchased or not used before for traveling, usually used for carrying clothes and personal belongings. Full definition
Here's a round - up of new suitcases and travel gear that offer the option to morph and fold, stop bullets, kill bedbugs and massage your feet.» (cnbc.com)
Have just taken delivery of our two (quite large) new suitcases in readiness for the just in case packing this weekend. (annasislandstyle.com)
Or, better yet, maybe buy Bono some new suitcases and clothes, since he evidently landed in Berlin without any clothes or suitcase. (relevantmagazine.com)