The foundation of these bags' protective capability lies in their advanced 3-layer construction, engineered to withstand extreme temperatures that would destroy ordinary storage solutions. The outer layer of silicone-coated fiberglass resists direct flame contact, while the middle aluminum foil barrier reflects radiant heat away from contents. The inner heat-resistant fabric adds an extra layer of insulation, creating a protective barrier that maintains lower temperatures inside even when exposed to intense heat up far exceeding the temperature of most household fires.The specialized lipo battery bag (8.9x7.5 inches) addresses the unique safety concerns of lithium-ion batteries, which can catch fire or explode if damaged, overcharged, or exposed to heat. Its internal dividers prevent batteries from touching each other, reducing the risk of short circuits that can trigger thermal runaway. The secure closure creates a tight seal that contains flames should a battery fail, protecting surrounding areas from damage while allowing safe handling of the bag during an incident.The companion fireproof document bag 2PCS Fireproof Document Bags,Lipo Battery Bag,Ebike Battery Bag, Fireproof Bag for Lithium Battery Storage and Important Papers, Ideal for Home,Garage and Travel(8.9x7.5 inches) offers the same high-level protection for important papers and small valuables. Its generous size accommodates standard documents, passports, birth certificates, insurance policies, and even small electronics like drives or external hard drives containing digital backups. The water-resistant material adds an extra layer of protection, shielding contents from water damage during firefighting efforts or accidental spills, unlike paper or plastic document sleeves that offer no such protection.Portability is a key advantage of these fireproof bags over rigid battery storage case alternatives. Their lightweight, foldable design makes them easy to store in drawers, closets, or safes without taking up excessive space.