The set of rubbers Igot for the roof were still sealed in a clear bag from the original manufacturer. I must have just got lucky.
For the S5 boot I suggest one large tent roll bag to go in the very bottom section, 2 airline carry on bags, one fits between the struts on top of the tent bag and the other sits down flat on the high section of the boot between the struts.
This still leaves space for the old fashioned make up cases that can fit in the side spaces. Other small cases or bags will also probably do the job