Material: Made from wear-resistant, scratch-resistant, and waterproof Oxford cloth with a polyester lining- Handle: Reinforced handle for easy carrying and pulling Zipper: Durable metal zipper- Wheels: Four removable and installable 360silent universal wheels for smooth movement in any direction- Foldable and Expandable: Two zippers at the bottom allow for capacity adjustment; expands from 28L to a maximum of 58L- Size: Normal size is 15.7 x 8.6 x 12.6 inches, expandable up to 26 inches in height