I haven't looked for the current rating, mainly because with the sketch only running the leds, the backpack last for more then 4 hours with all the lights flashing all the time. My wife and friends have used the backpack already several times, but always just with the sketch solely with the ledsprogramming.
It is so that I haven't had in mind the extra need for power from the MP3 player.
But what really puzzles me, is that the sketch as it is, commenting out all lines of the sound, compile it, upload it with the circuit setup as in the image and 2 powerbanks ... ... works like a clock....
It's when I decomment again the sound parts, compile the sketch (without problems), upload it again, the Arduino seems to protect itself after about 10-15 seconds by shutting off. Even the Voltmeter, which is running directly from the powerbank, and is in no way conected to he Arduino, goes dead.
Once I toggle the switch to shut the power down and toggle it on again, it does the same thing, shuts off, voltmeter dead, and on and on ....
I even switched out an Arduino (I bought several), and it does exactly the same.
What is a huge mystery is that it worked before, when I had it powered over the computer. I was so proud I have it on video.
It's starting to frustrate me, as I believe it has to do with power, more then it has to do with the sketch, but than again I know the sketch is far from ok (although it compiles without any error). 
