The CamelBak Crux Replacement Tube is perfect for when you're getting chased by a mountain lion and it tries to pounce on you, but you dodge nimbly out of the way, and the mountain lion's claw just barely misses you, but it catches on the high-flow polypropylene tube of your hydration system, causing it to tear open, and the mountain lion is like "woah that's a sweet hydration system tube," and thanks to that momentary distraction, you manage to escape certain death, but now you need to get a new tube for your CamelBak because the old one is broken.