These car seats are compatible with the Baby Jogger City Mini and City Mini GT Double Strollers from 2015-2018 using an adapter:
Please note these adapters are not compatible with the newer Version 2 model of the stroller from 2019 or later. See this page for Car Seats Compatible with the City Mini 2 Double or City Mini GT 2 Double strollers.
The double stroller holds only one car seat; it does not hold two car seats for twins.
These car seat adapters do not fit the single versions of the City Mini and City Mini GT. If you have a single stroller, see Car Seats Compatible with the City Mini/City Mini GT Single Stroller.