Cordura® Classic 1000den is extremely abrasion and tear resistant. The yarn is air-texturised creating a matt and structured appearance. Provided a proper weaving pattern is being used Cordura® Classic is a good bit more abrasion resistant than oxford nylon or polyester fabrics of a similar weight. With adding only 30% of extra weight 1000den Cordura® Classic shows a tensile strength which is about 2.5 times stronger than the one of 420dn oxford nylon. "

What does 1000den mean in the real world of backpacks?

A trekking pack made entirely from 1000den Cordura® classic turns out to be approximately 8-10% heavier but 30-40% more abrasion resistant than a model built from 420den or 500den nylon fabric. For the extra 10% which is less than 300 grams you get a pack body which is close to impossible to wear out. Of course no pack can withstand constant abuse. Eventually some part will always fail. If you go for 1000den it will most likely not be the fabric!