Flying with 2 Small dogs, Need a double carrier.

Hi! Im flying United with 2 small dogs. They are both chihuahua mixes. One is 7lbs the other is around 14lbs. The 14 pounder has anxiety but I do have some Trazodone to give her before the flight. Im flying solo and will have to buy a second seat for them. The flight will be around 5 hours. Im looking for a good duo pet carrier that is easy to carry and is airline/TSA approved, if anyone has any recommendations please let me know!! The maximum dimensions for each pet carrier are 11x11x17 I believe. This is my first time flying with a pet too so if you have any helpful advice it would be greatly appreciated. 🙂