No need to choose between bear and critter protection. The Ursack Bags protects your food from all creatures great and small. Not only will they keep out bears teeth and claws it will thwart mice, raccoon, squirrels, pine martens and other sharp toothed critters. Ursack bags are made with a patent pending laminated process that combines the UHMWP or Kevlar fabrics. Water and torn resistant. An odor barrier bag (OPSak) and an aluminum liner serve to make the bags evem more comfortable and durable. Without the optional aluminum liner, your food may be crushed, ripped or punctured. Features & details CRITTER PROTECTION: The Major is critter resistant; the updated version features a tighter weave and more than double the tear strength of previous models LIGHTWEIGHT & SPACIOUS: The Major weighs 7.6 oz with the capacity about 10.65 Liters (approx. 5 days of food for 1 person) MATERIAL: Made of "bullet proof" UHMWP fabric and is designed to prevent bears from getting your food in their territory STRENGTH & DURABILITY: 6 foot, 2,500 pound high tensile strength cord with a secure knot