PAPROOS 3-Piece Luggage Set (20''/24''/28''), Hardshell Lightweight Suitcase with USB Port and Side Hooks, Travel Luggage with TSA-Lock, Hardside Rolling Luggage for School, Travel, Blue #2

My family travels internationally which means lots of airplane transfers, rail, ferry loading and unloading. Each member has their own set. Only one cosmetic scuff has appeared. About to order another set for my mother as we are taking her to London, Scotland and Ireland for the holidays. We rarely use the middle size. The small size we carry on and the largest size we check. Very pleased with maneuvering and durability of wheels on various rough surfaces. The retractable handle makes for easy storage on ferries and railway. We've had zero issues with locking mechanism. We are a family of 4 with kids age 8 and 12.