Summit packs are special breed. They are required to comfortably carry their contents, but do it for minimal weight. The materials need to be tough enough for alpine environments, but packable enough to fit in a minimalists backpack. And, as they are used at points of critical need, they need to perform. Delivering 18L capacity with carefully selected features, the Cierzo 18 weighs a scant 370 grams (13.0 ounces) and is specifically designed for rapid ascents in alpine environments. The pack is made from N210p-HT nylon 6,6 high-density plain weave fabric. Highly packable, this special blended high tenacity nylon weave increases durability and tear resistance, and has a water repellent finish and polyurethane coating for weather resistance.