HEROIC KNIGHT Travel Laptop Backpack, Water-Resistant 15.6 Inch Business Laptop Rucksack Bag with USB Charging Port, Anti-Theft Carry on Backpack, High-Tech Casual Daypack for Work Office CollegeRugged & Waterproof Material: The rucksack for men is crafted from 1800D waterproof Oxford fabric, offering exceptional resistance to abrasion and scratches. The interior is lined with durable polyester fibre. Designed for comfort, Heroic Knight rucksack features breathable mesh shoulder straps and an EVA laminated back panel, ensuring effective ventilation and heat dissipation while alleviating strain on your shoulders and back.