A Chargeable Bag or A Portable Battery?
One is called the Hustle bag, which is a bag that charges your phone and also alert you when your phone is about to run out of battery. It works with any kind of smartphons and comes in three different models. Here is the video so you can have a closer look.
If you don't like the design of these bags here is another solution. This is a portabel charger called Puku, which was seen a lot on the Fashion weeks. Here is the video to see more.