Whether you’re loyal to a particular brand (think Tupperware or OXO) or a certain material (plastic, glass, or stainless steel), food storage containers are kitchen essentials. They’re just the thing for storing leftovers or components of a make-ahead meal, but they can also do double duty, serving as a container to transport lunch or snacks when you’re on the go. And it’s important to clean them properly if you want to ensure their longevity—some types can last years, not months, if you know how to maintain them. Ahead, we’re sharing the difference between three common materials, how to properly care for food storage containers, and signs that it’s time to replace yours.
Plastic
In terms of durability, plastic is the most likely to show wear and tear and absorb food odors and stains. “It’s important to keep track of how long you’ve had a plastic container, as chemicals can ‘leak’ out of the plastic when heating up,” says Leanne Stapf, Chief Operating Officer of The Cleaning Authority. An obvious sign that it’s time to throw out a plastic container is if it is cracked, discolored, or deformed. If you own plastic containers that are not BPA-free, you may want to get rid of those, too. Studies have found that Bisphenol A, or BPA, is an endocrine-disrupting compound, which may disrupt normal hormone functions in the body. Depending on the material of the plastic container, it may need to be hand-washed. “While most plastic items are dishwasher-safe, be sure to read all labels. Some plastic [particularly thin, takeout-style containers] can warp due to the high temperatures. In the long run, [some] plastic food containers can get damaged from dishwasher use and lose their shape,” adds Stapf.
I’ve noticed that plastic containers, especially the cheaper ones, tend to hold onto smells like last week’s spaghetti sauce, no matter how much you scrub. To make the most of your plastic containers, try soaking them in a mix of warm water and a splash of white vinegar for an hour before washing—this can help lift stubborn odors. Also, if you’re like me and love a good deal, you might be tempted by those flimsy takeout containers, but they’re often not worth the hassle since they warp so easily. A study from the Environmental Protection Agency notes that about 70% of plastic food containers in the U.S. are now BPA-free, which is great, but older ones might still pose a risk, so check your stash. To extend their life, I always place plastic containers on the top rack of the dishwasher to avoid the intense heat at the bottom.
Glass
Glass is a choice that is far more eco-friendly, safe, and durable than plastic containers. According to OXO, glass should be replaced for safety reasons if it becomes chipped. The heavy nature of glass containers also means that they are better suited for storing leftovers or prepared food in your refrigerator or freezer than for using as a travel container. They also tend to be bulkier, so if you’re short on space, plastic may be easier to store. Wash them in the dishwasher after each use and glass containers will last for years.
I love using glass containers for meal prep because they just feel cleaner and don’t stain, even with something like curry. One trick I’ve learned is to let hot food cool down before transferring it to glass to avoid thermal shock, which can cause cracks. Glass is also fantastic because it’s recyclable, and according to the Glass Packaging Institute, about 80% of glass containers are recycled in the U.S., making it a solid choice for eco-conscious folks. If you’re tight on cabinet space, try stacking them neatly with a piece of parchment paper between each to prevent sticking or scratching. And while they’re heavier, I find the sturdiness reassuring—nothing’s worse than a flimsy container spilling soup in your bag!
Stainless Steel
Stainless steel is rising in popularity for food storage containers because of its eco-friendly nature. The downside to stainless steel containers is that they’re not transparent, so you can’t see what’s inside. Another con is that unlike glass and some plastic, stainless steel containers cannot go in the microwave or oven. However, they’re odor-resistant so the flavors and smells from a potent meal won’t penetrate the metal. They’re also highly durable, eco-friendly, and dishwasher safe, which makes clean-up a breeze. They may show scuff marks or scratches eventually, but this is only cosmetic and won’t affect the performance of the container. With proper care, stainless steel containers will be good to use for years to come.
I’ve been using stainless steel containers for my kids’ lunches lately, and they’re a game-changer for durability—those things can take a beating in a backpack! To keep track of what’s inside, I stick a small label on the lid with a dry-erase marker; it wipes off easily and saves me from playing the guessing game. Stainless steel is also a win for the environment—studies suggest that stainless steel products can be recycled at a rate of nearly 90%, which feels good when you’re trying to cut down on waste. If you’re worried about scratches, a quick polish with a microfiber cloth can keep them looking sharp. Just don’t expect to pop these in the microwave—trust me, I learned that the hard way!
