What are the strongest backpacks made of?

The strongest backpacks are typically made from high-denier nylon or polyester fabrics, often reinforced with ripstop technology to enhance durability and resistance to tearing. Many feature waterproof coatings or laminations for weather protection, and robust hardware, such as heavy-duty zippers and reinforced stitching, to withstand heavy loads. Additionally, some backpacks utilize materials like Cordura, known for its abrasion resistance, making them ideal for rugged outdoor use.