The Patagonia 6L Black Hole Cube Bag is made from burly recycled polyester ripstop with a matte, weather-resistant, recycled TPU-film laminate, and the main compartment is divided equally with zippered mesh pockets. The exterior daisy chain is for lashing onto packs and racks or clipping onto duffel bags, and it has a large grab handle with plastic zipper sliders for corrosion resistance in saltwater applications. This fits inside Black Hole duffels for seamless packing; cube volume is 6 liters. Made in a Fair Trade Certified factory, which means the people who made this product earned a premium for labor.