Plastic containers and bags are a staple in most kitchens. They’re convenient, easy to stack, and seem like the obvious choice for storing leftovers and fresh groceries. But for some foods, plastic actually shortens their shelf life instead of protecting it.
The problem is moisture. Plastic often traps humidity and limits airflow, creating conditions that encourage mold, soften crisp produce, and speed up spoilage. Many foods stay fresh longer when they have a little room to breathe.
Here are 15 foods that often go bad faster when they’re stored in plastic.
Bread
Fresh bread naturally contains moisture, and sealing it inside plastic can trap that moisture around the loaf. Before long, mold starts to grow, especially during warm weather. Plastic can also leave crusty bread soft and chewy instead of crisp.
If you’ll eat the loaf within a few days, store it in a bread box, paper bag, or wrapped in a clean kitchen towel. For longer storage, freezing is usually the better choice.
Related: How to Keep Bread From Getting Moldy Too Quickly
Cheese
Cheese needs a balance between moisture and airflow. Wrapped tightly in plastic, it often develops condensation, making the surface sticky and shortening its freshness. Some cheeses also lose flavor when they can’t breathe.
Wrap cheese in wax paper or parchment paper first, then place it in a loose container or reusable storage bag.
Related: These ’60s Foods Were Once Everywhere — Do You Remember Them?
Mushrooms
Mushrooms act like little sponges, soaking up any moisture around them. In a plastic container or bag, condensation builds quickly, leaving them slimy within a day or two.
A paper bag in the refrigerator absorbs excess moisture and helps mushrooms stay firm much longer.
Related: You Don’t Have to Spend a Fortune to Be Prepared—Try These 15 Frugal Tips
Lettuce
Leafy greens don’t last long if moisture gets trapped around them. Plastic bags often collect water droplets, causing lettuce to wilt, turn soggy, and eventually become slimy.
Wrap the leaves in a paper towel before placing them in a produce drawer or a loosely covered container. The paper towel absorbs excess moisture and helps keep the lettuce crisp.
Onions
Whole onions stay freshest in a dry place with good airflow. Plastic traps humidity, which encourages mold, soft spots, and sprouting.
Store onions in a mesh bag, basket, or another well-ventilated container away from direct sunlight.
Garlic
Garlic has storage needs similar to onions. Sealing it in plastic traps moisture around the cloves, making them soften or sprout much sooner.
A wire basket, garlic keeper, or open bowl in a cool, dry spot is a much better home for garlic.
Potatoes
Potatoes need cool temperatures and good air circulation. Plastic bags hold in moisture, speeding up sprouting and causing potatoes to soften before their time.
A paper bag, burlap sack, or open basket stored in a cool pantry works much better.
Berries
Fresh berries spoil quickly under the best conditions. Once moisture builds inside a plastic container, mold often follows.
Store berries in a shallow container lined with a paper towel, and avoid washing them until you’re ready to eat them.
Cucumbers
Plastic traps moisture around cucumbers, which can cause them to become soft, watery, and slimy sooner than expected.
Wrapping each cucumber in a paper towel before placing it in the refrigerator helps absorb excess moisture and keeps it crisp longer.
Tomatoes
Tomatoes continue to ripen after they’re picked, releasing ethylene gas in the process. Plastic traps both moisture and that gas, speeding up ripening and shortening their shelf life.
Keep tomatoes on the counter until they’re fully ripe. Once ripe, refrigerate them only if you need a few extra days before using them.
Bananas
Bananas naturally release ethylene gas, which speeds up ripening. Sealing them in plastic traps that gas around the fruit, causing them to brown and soften more quickly.
Leave bananas uncovered on the counter or hang them from a banana hook to help slow the process.
Related: How to Stop Bananas From Turning Brown So Quickly
Fresh Herbs
Fresh herbs like cilantro, parsley, and dill wilt quickly inside plastic bags because excess moisture collects around the leaves.
Trim the stems, place them in a glass with a little water, and loosely cover them before refrigerating. Many herbs stay fresh for days longer this way.
Apples
Apples are fairly hardy, but sealing them inside plastic can trap moisture and reduce their crisp texture over time.
Store apples loose in the refrigerator or in a cool spot where air can circulate around them.
Peppers
Bell peppers and other sweet peppers soften faster when moisture gets trapped inside plastic bags.
Keeping them loose in the refrigerator’s crisper drawer usually helps them stay firm for a longer period.
Avocados
Plastic can trap moisture and the natural gases avocados release while ripening, causing them to become overripe sooner than expected.
Let avocados ripen on the counter in the open air. Once they’re ripe, move them to the refrigerator if you aren’t planning to eat them right away.
