Twenty years back when I started using light aircraft for long trips in Europe I has five Jepp books, countless maps, and all sorts of navigation equipment all the flight planning had to be done manually and flight plans got faxed.
The whole plot took ten Kg off the payload of the aircraft.
Now I have two iPads, the mini for use in flight and the standard iPad because my fingers are too big for the mini most of the time, all the flight planing can be done over the Internet, the flight log is on the iPads, two iPads provide redundancy and carry world wide Jepp coverage and all with a weight reduction of in the order of 400%.
Anyone who is not using tablet technology in the cockpit is as the Brits say........Dagenham !