The leather I have dealt with quite a bit Dubbin, so it is preserved and is water repellent.
The size, I find the way, super, one reviewer said here, the trailer is smaller than expected. I can not confirm, I think the size is just right!
With ~ 20EUR certainly not a cheap accessory, but definitely nice! Would I buy it again. A super nice gift!
For the Audi logo I decided, if I do not drive a times more A4, but an A3 or A6 or anything else ;-) The Audi logo is simply "independent".