Is it true that efficient food packaging should protect food from microbial contamination and physical damage like spillage and breakage? 

The main purpose of food packaging is to protect the food from contamination and physical damage, thus ensuring its safety and quality. This includes protecting the food from microbial contamination, as well as preventing spillage and breakage during transport or storage. While packaging can also play a role in making the food look attractive and easier to transport, its primary function is to preserve the food and keep it safe for consumption.