Quoting .chele.:" I'm assuming the Chicco you bought used, since they are always sold with the base when new! In that ... [snip!] ... new! In that case, I would use the Maxi Cosi Pria...unless that was also purchased used, in which case I wouldn't use either."
I actually bought it from wally world! It just came with the carrier and instruction manual. They had the bases right beside them and then beside that they had the strollers. I didn't grab the "travel pack" or even just the base at the time because I didn't think I would actually be using it in the car. It was either buy the set or pay close to 100$ for the base and 200$ for the seat, and I already had a stroller and carseat, so I opted for just the seat! The Maxi cosi was ordered from the actual website, son of a bitch took 7 weeks to get here!