The RT35 was from Arc'teryx's early technical era in the 2000s geared towards purists. Arc'teryx don't make bags like this anymore. This is a solid and well built bag that will continue to perform for many years.
It's in overall very good condition apart from a tiny tear on the bottom of the bag, as shown. This can be easily fixed with a tenacious tape patch. Despite the age of the bag, there's very little discoloration, if any.