Expand Function: 28in is Expandable add 15% to the scalable space. Tough corner guard Integrated TSA-accepted lock Adjustable telescoping handle Fully featured interior Soft-touch top and side handles More: 1. Lockable: Showkoo set has a TSA-approved keyless lock to ensure your security and peace of mind while traveling. 2. Premium Material: Made of lightweight and durable ABS material, with an impact-resistant shell. 3. IATA approved: The carry-on is suitable for cabin luggage according to IATA standard (fits in overhead bins). 4. Easy mobility: Super resistant aluminum trolley handle that fits perfectly on the palm and silent and smooth-running spinner wheels for easy mobility.