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Silicone Food Covers

Published November 2020

How we tested

When we need to cover a bowl for storage or transport, we usually reach for plastic wrap. Silicone food covers (often called "silicone lids" or "reusable lids") are heat-resistant, dishwasher-safe, reusable alternatives. They come in two styles: stretch covers made of flexible silicone that expand to wrap over and around the rims of the bowls, and flat covers that rest on top of the bowls' rims and create a tight seal via suction. We wondered which were best, so we put together a lineup of three sets of stretch covers and three sets of flat covers. Five were sold as sets; we assembled the final set by purchasing matching small, medium, and large lids that were sold singly. All told, the covers in our lineup were priced from about $9 to about $34 per set. We used the covers to seal metal, glass, ceramic, wood, and plastic bowls of various sizes. We tested the tightness of the covers’ seals by shaking and overturning the covered bowls that we’d filled first with grapes and then with water. To further gauge performance, we used the lids to cover bowls of fruit salad that we then stored in the refrigerator for three days. We also used the lids to cover and heat bowls of water in the microwave, deliberately smeared them with condiments to see if they stained, and both washed and stretched them repeatedly. We were looking for a set of covers that could form a strong seal on all types of bowls, keep food fresh, resist stains and odors, and hold up to use over time. 

The Simpler, the Better

There were stark differences in how easy the two styles of covers were to use. The stretch covers were particularly difficult to wrangle onto bowls of all types for three reasons. First, each cover expands widely from its initial diameter, so selecting the right size from the pile was a guessing game. It often took us several tries to find the stretch cover that fit a given bowl. Second, holding the stretch covers in place on one area of a bowl’s rim while trying to cover the other edges was difficult—despite small tabs on the covers’ perimeters meant to assist in stretching. We didn’t have enough hands to both brace and stretch at the same time. We found ourselves having to brace the bowl against our torsos and stretch with both hands, worrying about spilling food the whole time. Even once we thought we had a good seal, the covers would sometimes pop off a few seconds later. Two of the stretch cover sets were especially hard to stretch and prone to slipping off the bowls’ rims; the remaining set had a bit more give, making it slightly easier to stretch and hold in place. Finally, the sizes in each set weren’t always compatible with the standard-size bowls in our kitchen. Two of the sets didn’t have an option large enough to cover the frequently used 5-quart bowl from our winning set of metal mixing bowls

In contrast, the flat covers couldn’t have been easier to use. The covers in two of the sets were almost perfectly round while those from the remaining set were shaped like lily pads; all three of the sets had central handles that made them easy to grip and move on or off containers. To seal a bowl, we simply set the most appropriately-sized cover right on the rim and gave it a slight push in the center. The covers would settle into the bowls as we pushed, letting out excess air, and then spring back slightly to form tight seals that were often strong enough for us to briefly pick up the bowls only by the covers’ handles (though manufacturers do not recommend this). To break the seals, we peeled the covers’ edges back from the bowls’ rims, then simply lifted them off. For the most part, matching the flat covers to the bowls was much easier: Covers that either matched bowls’ diameters perfectly or were moderately larger in diameter than the bowls both created tight seals. And two of the flat cover sets had options large enough to cover our largest mixing bowl. When it came to ease of use, the flat covers won out over the stretch covers every time. 

Forming Strong Seals

We continued to notice differences between the two cover styles as we evaluated seal strength. Once we finally managed to muscle the stretch covers onto bowls filled with fruit salad, we stored them in the refrigerator for three days, along with a bowl of fruit salad we covered with plastic wrap for comparison. Two stretch covers stayed on and kept the fruit just as fresh as the plastic wrap did, but the remaining stretch cover frequently popped off throughout storage, much to our frustration. As a result, the fruit in that cover’s bowl was a bit drier than the other samples after three days. Still, every stretch cover formed tight seals over bowls filled with both grapes and water, which stayed in place when we shook the bowls or tilted them over the sink.

Conversely, all the flat covers were able to strongly seal bowls made of every material we tried, including metal, glass, plastic, ceramic, and wood. They preserved fruit salad as well as plastic wrap over the course of three days, since they remained tightly in place throughout the refrigeration test. However, we did have some trouble with the flat covers during the grape and water tests. Their seals eventually broke, sending grapes flying or water dribbling into the sink. But we like the flat covers for their aptitude where it counts; their ability to easily store food in the refrigerator or cover it on the go makes them a great storage option. 

The manufacturers of all the covers in our lineup recommend them for use in the microwave as covers for heating leftovers or steaming vegetables. All the stretch covers are advertised as being microwave-safe, but one company warned against using its covers to completely seal bowls while microwaving. We found out why: When we used the stretch covers to seal glass bowls filled with water and then heated the water in the microwave to boiling, expanding steam caused the stretch covers to pop off. Leaving the bowls slightly uncovered wasn’t feasible because the lids only stayed in place when they were fully stretched around the bowls’ rims. The flat covers performed better. As the water boiled, steam escaped through tiny openings that formed around the rims, but they contained most of the steam and hot air well—much better than the exploding stretch-style covers. We still think the primary use of these covers is food storage, but the flat covers’ usefulness when microwaving was a plus. 

Durability Mattered

We were interested in whether the covers would retain stains and odors and how they would hold up over time, so we conducted a few durability tests. First, we spattered the covers with measured amounts of ketchup, mustard, and olive oil, and then we let them sit overnight and washed them the next day. When we smelled them, we noticed that all the covers retained strong odors. The three stretch covers and one of the flat covers also held on to mustard stains. However, every cover’s stains and odors faded with additional washings. Second, all the covers are dishwasher-safe, so we washed them another 10 times in the dishwasher. Each cover survived unscathed, without warping or deterioration. Finally, we stretched one cover from each set to its limits 50 times before checking for any signs of damage. Five of the six covers perfectly retained their shape and structural integrity, but one lackluster stretch cover warped the slightest bit. It was harder to secure that cover over a bowl due to its altered shape. 

The Best Silicone Food Covers: GIR Suction Lids

In the end, we weren’t impressed with the stretch covers, and we can recommend only one set with reservations. We had trouble deciding between two flat covers when naming a winner, so we compared their performance in one more test. People sometimes use silicone flat covers to act as lids for pots and pans while cooking, so we used both covers as we steamed broccoli for Beef and Broccoli Stir-Fry. The scalloped edges of the lily pad–shaped cover didn’t fit our 12-inch skillet perfectly, letting steam escape. A model from GIR performed the best: Its nearly round shape covered our winning 12-inch skillet well, and it trapped the perfect amount of steam to cook the broccoli to an ideal crisp-tender texture in only a few minutes. It works well on most 12-inch skillets, making it an acceptable substitute for our winning 12-inch skillet lid. The GIR Suction Lids made strong suction seals on bowls of a variety of materials and sizes, but they're not infallible: much like plastic wrap, if you cover a bowl with one of these lids and shake it hard enough, the seal will break. Still, under normal use, they excelled, preserving fruit salad as well as plastic wrap, resisting stains, holding up to repeated washings and 50 vigorous stretches without any signs of deterioration, and even containing steam well in the microwave. These covers would be a great addition to your food storage lineup.

Methodology

  • Test six cover sets (three stretch lids and three flat lids), ranging in price from about $9 to about $34 per set 
  • Cover and seal glass, metal, ceramic, wood, and plastic bowls of various sizes with covers to test fit and versatility 
  • Place grapes in bowls, cover, and shake vigorously to evaluate tightness of seal 
  • Fill bowls with water, cover, and tilt bowl to test water-tightness of seal 
  • Cover and seal bowls of fruit salad with both covers and plastic wrap; store in refrigerator and compare freshness after 3 days
  • Boil water in covered bowls in microwave, evaluating how well seals hold in steam
  • Spatter covers with ketchup, mustard, and olive oil; let sit overnight; then wash covers once and see if they stain or retain odor
  • Top two flat covers only: Use covers to trap steam in our winning 12-inch skillet while steaming broccoli
  • Wash covers an additional 10 times in the dishwasher
  • Stretch covers 50 times

Rating Criteria

Ease of Use: We evaluated how easy it was to cover and seal bowls with the covers

Performance: We tested how strong the covers’ seals were, and how well they preserved food

Ease of Cleanup: We rated whether the covers were easy to clean

Durability: We evaluated how well the covers held up to repeated use

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The Results

Winner
Recommended

Design Trifecta 360 Knife Block

Admittedly expensive, this handsome block certainly seemed to live up to its billing as “the last knife block you ever have to buy.” The heaviest model in our testing, this block was ultrastable, and its durable bamboo exterior was a breeze to clean. Well-placed medium-strength magnets made it easy to attach all our knives, and a rotating base gave us quick access to them. One tiny quibble: The blade of our 12-inch slicing knife stuck out a little.

$248.64*
Recommended

Schmidt Brothers Downtown Block

This roomy block completely sheathed our entire winning knife set using just one of its two sides—and quite securely, thanks to long, medium-strength magnet bars. Heavy, with a grippy base, this block was very stable. An acrylic guard made this model extra-safe but also made it a little trickier to insert knives and to clean; the wood block itself showed some minor cosmetic scratching during use.

$141.90*

Schmidt Brothers Midtown Block

This smaller version of the Downtown Block secured all our knives nicely, though the blade of the slicing knife stuck out a bit. With a base lined with grippy material, this block was very stable. An acrylic guard afforded extra protection against contact with blades but made it a little harder to insert knives and to clean; the wood itself got a little scratched during use.

$67.99*
Recommended with Reservations

Swissmar Bamboo Magnetic Knife Block

This small, scratch-resistant model had a stable, rubber-lined base and could hold all our knives, though the blade of the 12-inch slicing knife stuck out a bit. But inch-long gaps between its small magnets made coverage uneven and forced us to find the magnetic hot spots in order to secure the knives. Its acrylic guard made it safer to use but harder to insert knives and to clean.

$49.93*
Not Recommended

Messermeister Walnut Magnet Block

This handsome block was done in by its shape—a tippy, top-heavy quarter-circle that wasn’t tall or broad enough to keep the blades of three knives from poking out. It lacked a nonslip base, and its extra-strong magnets made it unnerving to attach or remove our heavy cleaver. Finally, it got a bit scratched after extensive use.

$129.95*

Epicurean Standing Knife Rack 12"

This magnetic block sheathed all our knives completely, though with a bit of crowding. But it was hard to insert each knife without hitting the block’s decorative slats on way down, and because the block was light and narrow, it wobbled when bumped. Worse, we couldn’t take it apart, so splatters that hit the interior were there to stay. Additionally, the outside stained easily, and when we wiped it down, the unit smelled like wet dog.

$99.95*

Kapoosh Rondelle Knife Block

This model stabilized knives with a mass of stiff, spaghetti-like bristles that shed and nicked easily after extensive use, covering our knives with plastic debris. While all our knives fit securely, several of the blades stuck out, making this unit feel less safe overall. Finally, though the bristles could be removed and cleaned in the dishwasher, their nooks and crannies made this block hard to wash by hand.

$24.99*

Kuhn Rikon Vision Knife Block, Clear

This plastic block required us to aim each knife into the folds of an accordion-pleated insert that was removable for easy cleaning but got nicked easily with repeated use. Because we could only insert the knives vertically, longer knife blades stuck out; a cleaver was too wide to fit. The lightest model in our lineup, this block was dangerously top-heavy when loaded with knives.

$35.88*