Back up Power Bank.

Always carry a backup battery pack when traveling.  But the newer large-capacity power banks are being restricted by airlines due to the fire hazard.  And some airlines are requiring you to keep your power bank out in the open (not packed) for the same reason of over heating.   Bottom line for most travelers, this is all you need.  A 8000mah battery that charges your phone and tablet.

 Small size (4"x3"x1") - can do 2 full phone charges (depending on phone) before needing to be charged again.  It comes with two USB charging ports can charge two devices at the same time using micro-USB cables.  Has overcharge protection built in.  

Input:  5V 1000 mA.  Output: 1000/2100 mA.  CE/FCC/ROHS certified.  Comes with a 2-device output cable and an input charging cable.  LED Display.  White.