The Key To Transporting Layer Cakes Is Easier Than You Think - Tasting Table
Briefly

Transporting a cake successfully hinges on temperature and stability. Prepare the car's interior to be cold and find a flat surface for the cake box.
Using a silicone mat under the cake box provides exceptional stability during transport. If unavailable, alternatives like non-skid shelf liners or yoga mats can also work.
Read at Tasting Table
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