TravelCross Columbia Luggage 3 Piece Lightweight Spinner Set - Black 3 piece set: one 28" suitcase, one 24" suitcase (both expandable) and one 20" carry on (not expandable). The carry-on is suitable for US airline cabin luggage according to IATA standards TSA-approved keyless LOCK (set by a combination code) Made of 100% lightweight ABS material - extremely durable material with tough corner guards Smooth-running spinner wheels Built-in OKOBAN (The Global LOST & FOUND Solution) <span class="a-text-bold">Safety matters:</span> All suitcases in this set have<span class="a-text-bold"> TSAkeyless LOCKs</span>(set by a combination code) - the most reliable device to protect your belongings. You are going to be thankful not to ever have your luggage broken into by the TSA. <span class="a-text-bold">Dimensions and weight</span><span class="a-text-italic"> (with wheels)</span><span class="a-text-bold">:</span> <span class="a-text-bold">Small piece (carry-on)</span> - 21.5 x 12 x 8.5 inches. <span class="a-text-bold">Medium piece</span> - 25 x 16 x 10 inches. <span class="a-text-bold">Large piece</span> - 29.5 x 19.5 x 10 inches Make sure you have the TSA lock on the original position 0-0-0 Press the small round reset button using a pen or pencil - you will hear a click Set the desired combination using the dials Press the side tab - you will hear a click