1. Best Cat Carrier Overall: Siivton 4 Sides Expandable Pet Carrier
It has 4 different sides that can expand individually, for you to adjust them according to your car space and is suitable for all types of travel, airline-approved.
5. Best Collapsible Carrier With A Litter Box: CHEERING PET Cat Travel Cage
You can stick both the collapsible litter box and water bowl to the bottom so they don’t move around the carrier, an important feature when you’re on the road.