The outer materials of the backpack are mainly 420D Oxford nylon, 1000D nylon, 600D or 1000Dpolyester (polyester), or 1000D CORDURA and other materials.
The 1000D material has high density and is very wear-resistant, making it very suitable for field use. CORDURA is a well-known high-grade wear-resistant nylon roving fabric developed by DuPont in the United States. The material's abrasion resistance is much higher than that of ordinary nylon or polyester, and it is lightweight.
More than 90% of the world's famous brand backpacks are made of this prestigious nylon material. These materials can withstand water pressure of 0.5m~2m, keeping the contents of the bag dry. Some materials also have a tear-proof function. Once punctured, the breach will not be torn apart and expanded.