The Osprey Women's Lumina 45 Backpack is an ultralight, multi-day pack with optimized comfort designed for minimalist-minded, gram-counting trekkers. By carefully packing only the essentials--hopefully all your backpacking products have the word "Ultralight" in the title--the Lumina has a capacity suitable for trips as long as two days. Weighing less that two pounds, it's remarkable how comfortable the Lumina feels with a full load. The ExoForm harness includes seamless, padded mesh at the shoulder straps and waist belt, and the rest of the backpack is suspended off your back with spacer mesh providing complete ventilation. One joy of packing this light is being able to move faster on the trail, and the Lumina is ready for fast-moving pursuits with a Lightwire suspension made of ultralight aluminum to perform with stable support.