CHOOSE 18″ FOR Compact control Braked spinner wheels, hidden seat and a smaller family-travel format. CHOOSE 20″ FOR More packing space Roomier 52 L capacity. The original 20″ model has no wheel brake. The key difference is control versus packing space. Both Moonba MultiCarry models include a fold-up child seat, safety belt, spinner wheels and front-opening storage. Feature 18″ Classic 2nd Gen 20″ Classic 1.0 Wheel brake Yes No Built-in seat + belt Yes Yes Opening Front opening Front opening Packing focus Compact format Roomier 52 L Colours White or black Yellow or white/grey 18″ Classic 2nd Gen Best when braked wheels and a more compact format matter most. Includes a hidden seat, safety belt, organized interior and temperature-keeping pocket. Shop white Shop black 20″ Classic 1.0 Best when the stated 52 L capacity matters most. Includes a fold-up seat, safety belt, front-opening storage and TSA-approved combination lock. No wheel brake: keep a hand on the suitcase whenever a child is seated. Shop yellow Shop white/grey Will either model count as carry-on luggage? That depends on the operating airline, route, fare and aircraft. “18-inch” and “20-inch” model names are not airline approvals; airlines normally assess the complete exterior including wheels and handles. The 20″ Classic 1.0 is approximately 15.5 × 11.5 × 23.6 in (39 × 29 × 60 cm) with wheels. Check the current limit before travel and plan for the possibility that the case must be checked. Safety applies to both sizes ✓ One child aged 2+ only ✓ Fasten the included safety belt ✓ Maintain continuous adult control ✓ Use only on flat, level surfaces ✕ No stairs, escalators or slopes ✕ Not a stroller, toy or child restraint Quick recommendation Choose 18″ for a wheel brake and compact format. Choose 20″ for 52 L capacity and continuous hand control. Read the Canada travel guide Shop all MultiCarry