Which Foods Belong in Which Storage Containers?

The best storage container depends largely on a food's fat content, acidity, and odor. Oily or acidic foods may stain plastic or leave an odor after prolonged contact, so glass is a safer choice for these foods. Strong-smelling foods can transfer odors to other refrigerator items if not kept in an airtight container.

When Should You Use Glass Containers? Storing acidic, deeply colored foods such as tomato sauce, pickles, or tomato paste in glass avoids staining the container and the risk of substances leaching from plastic into food. Glass can also be used in a microwave and oven, making it a convenient option for meals that need reheating. Plastic may warp at high heat or pose an increased risk of substances leaching into food. Glass is heavier and can break, so it may not be the best choice for food that is carried around often.

When Are Plastic and Vacuum Containers Suitable? Plastic is convenient for dry beans, grains, and nuts, which have little moisture and a low risk of transferring color or odors. Its light weight and durability make it practical for everyday use. Vacuum containers or bags reduce air exposure, which can slow spoilage. For perishable foods such as ground meat or fish, removing air may extend shelf life. For freezer storage, vacuum-sealed or resealable bags with little air space can help reduce ice crystals and freezer burn.

When Should You Avoid Certain Containers? Do not put hot food in a tightly sealed container; let it cool close to room temperature first. Steam may collect and condense inside a closed container, creating conditions that support bacterial growth. Metal containers should not remain in prolonged contact with acidic foods such as lemon or vinegar-based marinades, because the acid may react with the metal and affect the container and the food's taste.

Why Should You Label Containers? Writing the contents and date on a container is a useful habit, especially for food stored in the freezer, where frozen dishes can be hard to identify even in clear containers. This can reduce waste and make it easier to track storage time. Removable tape or an erasable marker makes containers easier to reuse; permanent-marker dates may remain on the container and become hard to read. Make sure the lid and base belong to the same set, since mismatched pieces may not fit tightly and can let air in. Periodically washing containers with hot water and a little vinegar may help remove lingering odors, especially from plastic.