Small, dark and snug is the spec
Leopard geckos ask very little of travel, which is why owners overbuild it. A small plastic tub with air holes, a floor of paper towel, and one lightweight hide is the complete setup, and the gecko will spend the journey under the hide, which is exactly the point. Skip loose substrate, which slides and buries, and skip the spacious tank, where every corner arrives as a small collision. A tub whose edges the gecko can feel reads to it as a burrow, and burrows are safe.
Gentle warmth for a ground-dweller
Geckos take their warmth from the ground up, so think floor, not air. For most journeys the cabin's comfort is enough. In cold weather, a heat pack taped beneath one end of the tub, outside the plastic and wrapped so it cannot scorch, creates the warm patch the gecko would choose in its enclosure, with the far end left cool so it can move away. Check with a fingertip on the tub floor at stops: warm, never hot. A gecko pressed flat on the warm end is content; one climbing the walls is telling you something is wrong.
Wedged in the cabin, out of the sun
Placement in the car decides how much of the journey the gecko feels. Wedge the tub in a footwell or between soft luggage where it cannot slide, tip or sit in full sun, since sun through glass overheats a small tub in minutes. Keep it off the rear shelf and never in the boot, where the temperature swings and the animal rides unobserved. Cover the tub with a cloth and the movement of the world stops; all that remains is the engine's hum, which a sleeping gecko ignores.
A journey it sleeps through
Do not feed a gecko for the journey, and do not feed it during. A gecko travelling on a full stomach, jiggled for hours, may regurgitate, and a sleeping gecko wants nothing anyway. Do not open the tub to check, photograph or reassure children: each opening is light, cold air and a giant's face, and the stress you are trying to prevent arrives precisely through kindness. If you must confirm the gecko is fine, look through the tub's side without lifting the lid; a curled shape under the hide is a gecko doing travel perfectly.
Settling a nocturnal traveller
At the destination, put the tub straight into the quiet room, open it beside or inside the waiting enclosure, and let the gecko walk out under its own power when it is ready, because tipping it out onto a cold floor undoes the whole calm journey in one second. Offer water that evening, leave food for the next night if it hides, and expect a skipped meal or two while it maps the new smells. For a question the drive raises unexpectedly, put a follow-up question to KinsLe's Kimmy; she answers using the KinsLe Answers library.