Wife talked to me about it before but after she hiked with me on the AT she see's there is no need for it here. I do go out solo or with my brother for weeks and never came close to needing it and I do carry a cell. Most cell phones will hold a charge for your 10 day section if you only turn them on to check in with a text or blog. They also sell a charger that will give your cell another little bit of power from a AA battery. This will save u money. Now in Aug I am heading to Alaska for 10 days and she IS making me rent one for that trip.