Yeah yeah, they're not disposable. Each parachute (type) has a standardized service life (number of jumps *) and service life (number of years) - after reaching them it is discarded. And - of course, it may be discarded earlier if it was damaged. ;-) Discarded parachutes can then be used to practice their folding or their material can be used differently - parachute jackets used to be popular ... *) in the case of gliders (gliders) it is the number of flying hours