What kind of fabric is the 'Cordura' mentioned in the bag's description?
While reading the bag's description, I saw the fabric name mentioned alongside the expression that it could even withstand sanding, making me wonder what properties it actually has.
RYOO explains that it uses friction-resistant Cordura nylon for the main body and that it is sturdy enough to withstand sanding with the bag.
This refers to the main body fabric that wraps around the exterior of the bag. The main body of the Symmetric Codura Backpack #2 [black] is made of 100% Cordura nylon[1]. It does not wear out easily. Generally, Cordura is a functional nylon fabric resistant to friction and tearing to the extent that it is widely used in military gear and outdoor bags. Being tougher than ordinary fibers, its threads do not easily unravel even when rubbed against rough surfaces or scratched by corners.
RYOO explains that this bag is made of a fabric durable enough to withstand sanding[2]. Considering the nature of a backpack that brushes against walls or frequently touches the floor while carried, a sturdy fabric was used all around so that the exterior does not fray easily. hmmm, it is a material chosen with clear confidence in its resistance to friction, enough to compare it to sandpaper.

The specific specifications or denier number of the Cordura fabric used have not yet been confirmed.