The definitive guide that you never wanted: Backpack fabrics (2017)
Ripstop weave does not help waterproofing. Nylon is no more likely to tear when punctured than any other thread. Packcloth is a weave, not another name for polyester. Polyester is stronger than cotton, not weaker. X-PAC does have fibrous strands since it is a laminate of woven fabrics.Also I think it is somewhat confusing to list thread materials like nylon and polyester, along with brand names like Dyneema and Cordura. Most Cordura fabrics are nylon, for example.Coatings are probably the weak point of durability for many packs. Any of the synthetic fabrics, even light weights, can easily last decades with normal use. But as the article notes, even with the best care, you won’t get much more than 15 years on the coatings. And when polyurethane goes bad, it’s gross. It smells horrible and becomes a sticky goo. It is depressing that despite decades of advancement in outdoor gear, companies are still just spraying PU on and calling it good.