Tumi Alpha 3 Backpack Shoulder Bag Business Sports Nylon 。Brand New TUMI Alpha 3 Expandable Backpack Legendary Ballistic Nylon Construction (Tear-resistant, Abrasion-resistant) Dimensions: 43 × 30.5 × 20.5 cm (17\" × 12\" × 8.1\") Professional-Grade Organization: ✓ Dedicated Tablet/Accessory Pocket ✓ Lockable Zippers & RFID-Blocking Card Slots ✓ Expandable Front Compartment for Additional Storage Space Smart Travel Design: ✓ Padded, Breathable Back Panel (Effectively Reduces Back Perspiration) ✓ Add-a-Bag Sleeve for Luggage Handle Attachment ✓ Water-Resistant Bottom Design