Wouldn't bacterial growth be a concern in a wet, warm environment for an extended period? Even if the food was bacteria-free, the container can pick things up f

Wouldn't bacterial growth be a concern in a wet, warm environment for an extended period? Even if the food was bacteria-free, the container can pick things up from the environment. Even if it's low-risk, on a long thru hike I wouldn't want any risk of stomach issues.