The full documentation picture at a rental counter.
Rental agencies generally want to see your passport, your original home driver's license, an IDP where relevant, and a credit card in the renter's name, all reviewed together rather than any single document in isolation. Missing even one of these can hold up or derail a rental pickup.
Laying out all of these documents together before heading to the counter, rather than digging through a bag mid-transaction, makes the process noticeably smoother.