[AnemicOak]

Looking for suggestions on the best external battery pack for my iPhone.

I'll be doing some traveling fairly soon that will have me out and about for most of the day each day and likely using my phone more than I normally do. The last time I did a trip like this I had an old Android phone (Galaxy S) with user replaceable battery so I just carried a second, charged, battery with me. This isn't an option with the iPhone obviously, or most newer Android phones, so I'm considering one of those battery packs that you charge up ahead of time and carry with you. I don't want something huge and heavy, but I'll be carrying a backpack everywhere so it doesn't necessarily have to be pocketable either. Ideally it would have a lightning cable/connector built in (bonuses would be micro USB & possibly the older Apple 30 pin) so that I don't also have to carry a cable, but having to use a separate cable isn't a deal breaker for the right product.

Anyone used one of these before? Any suggestions?