Hopkins Backpack - 18" Charcoal Gray. Carry this stylish and rugged looking Olympia Hopkins backpack to your next weekend trip. Lightweight and durable, this 18 inch backpack is made of 1680D ballistic polyester that is water-resistant. It features a laptop compartment that fits any 15.5 inch laptop with ease. There's a deluxe internal organizer to help keep your clothes, book, and accessories neatly segregated. To ensure complete safety of your belongings, this polyester backpack has a magnetic closure with buckle strap and an additional draw cord closure at the top opening. You can carry it comfortably for hours, thanks to its S-curved padded shoulder straps.