This is the 45 liter backpack by Peak Design. It’s a carry on. That expands to fit more. And contracts to become a day bag. Access it from the back. The sides. And the front. Shoulder and waist straps are rugged. Comfortable. And adjusts to your body. Yet, they tuck away brilliantly. Its got dual side pockets. Top pocket. Hidden pockets. And external straps to carry even more. Everything is packed in a durable, 100% recycled nylon shell. And it works perfectly with Peak Design packing tools. The Peak Design Travel Backpack. Because no two trips are the same.