With Sigma 5.0, innovative features work together to deliver classic designs that are incredibly lightweight yet extremely durable. The 21" Expandable Carry-On Spinner Upright features a 360 degree dual spinner wheel system that glides in any direction with exceptional ease. The retractable handle system has an ergonomic push-button locking handle to help minimize hand fatigue. The interior features a luxurious lining and multiple accessory pockets for many organizational options. For your convenience, the deluxe interior wet pocket keeps small toiletry items separate from other packed items.