The perfect size paper egg carton for storing eggs safely is one that snugly fits the type of eggs you have, typically standard chicken eggs. Here are some considerations for selecting the right size:

12-Egg Carton: Standard paper egg cartons are designed to hold 12 chicken eggs. These cartons are widely available and are a good choice if you have a dozen chicken eggs to store.

6-Egg Carton: If you have fewer eggs, a 6-egg carton may be more suitable. These cartons are smaller and can be a better fit for smaller quantities of eggs.

18-Egg or 24-Egg Carton: If you have a larger quantity of eggs to store, you can opt for 18-egg or 24-egg cartons. These cartons are less common but can be found in some stores.

Specialty Cartons: Some cartons are designed for specific types of eggs, such as jumbo chicken eggs or duck eggs. If you have non-standard eggs, make sure to choose a carton that accommodates their size.

The key is to select a carton that provides a secure and snug fit for your eggs. Eggs should not move around too much within the carton, as excessive movement can increase the risk of cracking. When placing eggs in the carton, make sure they sit comfortably and are not too tight or too loose.

Additionally, always store your egg carton in a refrigerator to maintain a consistent and cool temperature, which helps keep the eggs safe and fresh. Proper storage conditions are just as important as the carton size for egg safety.