Either a deep cycle marine battery in it's own case or a personal generator in its own case
Your charger and cables in itheir own case.
Your batteries in their own case..
I've combined the charger, leads, hardware, misc...into a Lift-N-Lok case for my electric flying and I have another for gas/glow.
Still have my batteries and charging battery in separate case.
Things tend to get heavy and bulky when put into an all-in-one set-up.