Toddler and Car seat - Barcelona & Ravenna

We are going on a cruise in a few weeks with our 2 year old. We leave from Barcelona and end in Ravenna.

I’m looking for car seat advice. We really don’t want to pack a car seat but are worried about the taxi from Ravenna to the airport (Bologna).

From what I’ve read, a car seat is not required for taxis within Barcelona, so the drive from the airport to the city should be okay.

I’m pregnant and travelling with a toddler is already a lot of baggage. We’re trying to keep it as light as we can so my husband is not carrying a million heavy things.

If anyone has any recommendations, advice, or personal experience, I’d appreciate it!