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As far as I remember, one of them is to take a First Aid Kit. Not sure about the other, smaller, one.
I've seen new vehicles with a complimentary bottle of Jaguar leather cleaner there next to the First Aid Kit. I first recall the strap on XJ40 which required HMSO and serious damage would occur if ordinary brake fluid was used. A bottle of Castrol HMSO was secured there. The continuation of the strap in subsequent models could simply be because it's useful for securing any small fluid container.
I had an XJ that stored a navigation CD in one of the holders.
It was just the case so you did not lose it since the disc is in the navigation unit.
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