I have a school assignment where I need to design a travel accessory, as far as the general design I have that down, but I have no clue what the avid traveller's needs, wishes, or wants in a product like this are, so if any of you have any ideas post them here, there's gotta be something that is needed or wanted that's not out yet.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500