The Patagonia Atom Sling Backpack - 8L is a small pack for travel and daily excursions. The hands-free way to carry just the essentials, whether headed to the coffee shop, exploring the city, or vacationing. The sling features an asymmetrical harness, designed to bring the pack weight close to the body to maintain all-day comfort. The fabric is 100% recycled polyester and has been treated with a PFC-free durable water repellent finish to deter light rain. At 8 liters, it's just the right size for tucking in a book, light layer, snack, and phone.