Designed with business and weekend travelers in mind, the newest version of our popular Mammoth backpack now features a dual duffle bag or shoulder carry function. Product features: Expandable from 25L to 35L. Dual shoulder or duffle bag carry. Mesh luggage compartment. TSA-friendly laptop and tablet compartments. Top and side carrying handles. Built-in trolley strap. Multiple zipper pockets and hidden rear zipper privacy pocket.