Wow, this is something I really wanted, but sadly I can't use this addon yet, because all the other addons I use aren't updated to 1.9.7 yet :(. But this is just a GREAT addon!
And maybe an idea for another backpack, how about something nuclear?
:MFS-Unit: :Advanced Machine: :MFS-Unit:
:Reactor: :Quantum-Bodyarmor: :Reactor:
:MFS-Unit: :HV-Transformer: :MFS-Unit:
It works basically as an nuclear reactor where you put in uranium cells and coolants, but it works also just like an MFSU, where you can charge and recharge items, lapotrons and stuff. It has a maximum storage of 50m EU and it recharges electrical items just like a batpack.