Why do you need a rope bag, you might ask, why does it matter if your rope gets dirty? Keeping your rope clean is more important than you might realize. When dirt and grit gets into your rope it dramatically shortens the life span by abrading the fibers in the core. This can give your rope soft spots or encourage the sheath to separate from the core sooner than might normally occur. Also, if your rope is dirty, not only does it negatively affect your rope but your other gear as well – all the bits of dirt act like sandpaper.