The Ursack Major is made of “bullet proof” UHMWP fabric and is designed to prevent bears from getting your food in their territory. It comes with an integrated six foot, 2,500 pound tensile strength cord. The Major weighs 7.6 ounces. It is about 24 inches in circumference, 14 inches tall and holds about 650 cubic inches (10.65 Liters). If packed only with freeze dried food, it will hold 37 single servings of breakfast, lunch and dinner.