TUMI - Voyageur Carson Laptop Backpack - 15 Inch Computer 。Dimensions: 43×30.5×14 cm (17×12×5.5 in) Daily commuting: umbrella + water cup + mobile power bank + equipment sundries; 15-inch laptop + documents/A4 folders Short-term business trip: 1-2 days of change of clothes + toiletry bag. Core functions: TUMI ballistic material: wear-resistant and tear-resistant, airport security hardness leaves no traces; Anti-theft design: hidden RFID card slot + anti-cut clothing inner layer; Ergonomics: S-shaped decompression shoulder strap + conductive mesh surface, no sweating after long-term use.