The specification worth checking is denier rating, a measure of thread thickness in the fabric, usually stated as a number followed by “D” (such as 420D or 1000D). Higher denier generally means thicker thread and better resistance to abrasion and tearing, at the cost of somewhat more weight than a lower-denier fabric.
A fabric’s weave and coating matter alongside denier — a ripstop weave resists a small tear from spreading further, and a water-resistant coating protects against moisture damage separately from abrasion resistance. Denier alone doesn’t capture every aspect of fabric durability, though it’s the single most useful number to compare between products.
Beyond the fabric itself, stress points — where straps attach to the main body, the base panel that repeatedly touches the ground — are where a pack usually fails first regardless of the main fabric’s denier rating, so reinforcement at those specific points is worth checking too.
Last reviewed 26 August 2026