I travel a lot. Not necessarily on vacations mind you. I just mean, I'm out and about on a daily basis, gone for side family visits on the weekend, and fly on a somewhat regular basis. Consequently, my daypack is always stuffed with cables for my gadgets, iPhone, iPad, backup battery charger, Bluetooth headphones and the like.
Naturally, there is some overlap there with the Lightning cable, but sometimes you need to charge the iPhone and iPad simultaneously. More importantly, my daypack is made for lightweight daily stuff and every time I cram one more even small item, it gets filled. Thankfully, I've added Nomad's NomadClip to the mix and I can store my charging cable on my belt clip, outside of the bag, and many other non-backpack locations.