What type of container must a first aid kit consist of?

A first aid kit should be weatherproof to ensure that its contents remain safe, dry, and effective regardless of environmental conditions. Weatherproof containers protect against moisture, dust, and other elements that could compromise the integrity and functionality of the medical supplies inside. This is particularly important in settings where exposure to the elements is possible, such as outdoor work sites or in areas with varying weather conditions. Ensuring the contents of a first aid kit are preserved in optimal condition is crucial for effective emergency response, as damaged or contaminated supplies can hinder medical assistance during critical moments.

Other options like closed, sealed, and metal hinged do not specifically address the importance of environmental protection, which is essential for the effectiveness of a first aid kit in various settings.