The Honest Version of My Silicone Lids Review

The box for the GUANCI 8-pack of silicone lids says the six sizes fit bowls, plates, pots, pans, and cups, and that's technically true the same way a one-size poncho technically fits everyone. I bought this set for the apartment kitchen I share with my roommate Priya, a mix of round Pyrex bowls from my mom, IKEA 365+ cereal bowls we split down the middle when we moved in, a few square glass storage containers, and a rectangular casserole dish that gets used maybe twice a month. Two of those shapes work great with these lids. Two of them don't work at all, and nobody selling the set tells you which is which before you buy.

This isn't a review written after a week of testing on dishes I picked specifically because they'd work. I went the other direction. I pulled out every bowl, plate, and container already living in our cabinets, measured the rim of each one with a tape measure, and matched it against the six lid sizes to see where the fit was actually tight versus where it was just close enough to pass in a product photo. Some of what I found matches what GUANCI claims. Some of it doesn't, and that gap is the whole point of this review.

How I've Used It

I didn't set out to write a sizing report. I set the lids out on the counter, tried the smallest one on a coffee mug, and it worked fine, so I moved on to the rest of the cabinet expecting the same. That's where things got uneven. Our kitchen isn't stocked with a matched set of anything. It's a mix of what I brought from my mom's house, what Priya brought from her old apartment, and a few glass containers from meal kits we never threw out because they seemed too nice to waste. That kind of mismatched cabinet is probably closer to what most people actually own than the tidy stack of identical round bowls shown in the listing photos.

The set includes six sizes, listed as roughly 2.5, 4, 5.5, 6.5, 7.5, and 8.5 inches across, with two duplicates for eight lids total. I measured each one with a soft tape measure laid flat across the underside, not stretched, and every size came in a little larger than listed, usually by a quarter inch to half an inch. That's not a defect exactly, silicone stretches and the listed number is probably the resting diameter, but it means the sizing chart on the box undersells how much room you actually have. If you're picking a size based on the chart alone, size down from what you'd guess, not up.

What the Size Chart Doesn't Tell You

Here's the detail that actually changed how I use these. The listing photos show every lid stretched over a round bowl, and round is where this product is genuinely good. The raised lip on the underside is designed to grip a continuous curved edge, and on anything circular, a coffee mug, a cereal bowl, a mixing bowl, a stockpot, it seals evenly all the way around because the tension is the same at every point on the circle.

Square and rectangular containers don't have a continuous curve, they have four corners, and that's exactly where the seal fails. I tried the 6.5-inch lid on a square glass container that measures about 6 inches per side, and instead of gripping evenly, the silicone bunches at the corners where the stretch has to change direction sharply. The middle of each side seals fine. The corners lift, sometimes just barely, sometimes enough that I can see daylight through the gap. On our rectangular 9x13 casserole dish, the largest lid doesn't come close to a real seal, it drapes over the top more like a loose tarp than a lid, and I've had it slide half off just from opening the fridge door too fast.

None of this is dishonest marketing exactly, the box does say bowls and pots more than dishes and pans, but the product photos on the listing lean hard on round dishes for a reason. If your kitchen is heavy on square Pyrex or rectangular baking dishes the way a lot of meal-prep kitchens are, know going in that this set will disappoint you on exactly the containers you probably want covered most.

Testing Every Lid Against What's Actually in My Cabinet

I kept a rough tally for thirty days of which lid I actually grabbed each time I needed to cover something, mostly out of curiosity about whether the size assortment made sense for how two people actually cook. The 4-inch and 5.5-inch lids did almost all the work, together accounting for well over half of every use. Those two sizes match our IKEA cereal bowls and a set of prep bowls almost exactly, round rims, snug fit, no gaps. The smallest lid, 2.5 inches, got used a handful of times on coffee mugs and small ramekins. The two largest lids barely moved off the drawer shelf, partly because our stockpot lid works fine on its own and partly because the casserole dish, as covered above, doesn't seal properly no matter which size you try.

What that tally told me is that the 8-piece assortment is built assuming a kitchen that uses large pots and pans as often as small bowls, which wasn't true for us. If your cooking leans toward big-batch soups and casseroles, the large sizes might earn their keep more than they did here. If you're mostly covering leftovers, snacks, and prepped ingredients the way we do, you're paying for two sizes you'll barely touch.

The Two Sizes That Get Used, and the Two That Don't

I want to be specific here rather than just saying some sizes work better, because the specifics are what actually help someone decide whether to buy the full set or a smaller one. The 4-inch lid is the workhorse. It fits our cereal bowls, a can of beans with the lid off, a small mixing bowl, and a single serving of leftover rice with room to spare. The 5.5-inch is close behind, covering our everyday soup bowls and a pint container of cut fruit.

The 7.5-inch and 8.5-inch lids are the ones I'd cut if GUANCI sold a smaller assortment. They're fine on a large round mixing bowl or a stockpot with a wide rim, but those situations came up rarely enough in a month that the two lids mostly sat unused. If you already own pot lids that fit your pots, which most people do, the largest silicone lids in this set are solving a problem you may not actually have.

Do They Actually Work on Plates?

The box lists plates right alongside bowls and pots, and this is where I was the most skeptical going in. A dinner plate is basically flat, with almost no rim for a lid to grip, so I tested it on a leftover half sandwich, a few slices of cold pizza, and a plate of rice with sauce that needed to go in the fridge overnight. The 6.5-inch and 7.5-inch lids worked here in a way I didn't expect, less because they seal against the plate's edge and more because they drape over the food and press down flat against the plate's own rim, which most standard dinner plates do have, just a shallow one.

It's not an airtight seal the way it is on a bowl, and I wouldn't trust it to keep something like soup from sloshing if you tilted the plate. But for covering food you're reheating or holding in the fridge overnight, it beats a paper towel or a second plate flipped upside down, which was our old method. This is honestly the pleasant surprise of the set. The bowls get all the attention in the marketing, but the plate use case, something I almost didn't test because I assumed it wouldn't work, turned out to be one of the more genuinely useful applications in our kitchen.

What I Tried Before These

Before this set, we were using a mismatched pile of Tupperware where half the lids no longer matched their bases, plus a roll of plastic wrap for anything that didn't have a matching lid. I go into that comparison in more detail in silicone lids vs plastic wrap, but the short version relevant here is that plastic wrap doesn't care what shape your container is. It stretches over square, round, and rectangular equally badly, or equally well depending on how you look at it. That's actually the one advantage plastic wrap has over these lids that nobody talks about: it's shape-agnostic. A silicone lid built around a circular seal is a worse fit for square containers than a sheet of wrap that has no seal geometry to fail in the first place.

I also tried a cheaper 4-pack of stretch lids from a different brand a friend gave me, and the sizing was even less predictable, one lid ran nearly an inch smaller than labeled. Compared to that, the GUANCI set is more consistent, the six sizes measured close to each other's expected proportions even though they ran a bit larger overall than the box states. If you've been burned by a cheaper set with inconsistent sizing, this one is more reliable, just not on the shapes it doesn't advertise clearly.

These are a great lid for a bowl and a mediocre lid for a dish, and the listing photos only ever show you the bowl.

Who This Is For

If your kitchen runs mostly on round bowls, mugs, and pots, cereal bowls, mixing bowls, a stockpot, a saucepan, these lids do exactly what they claim and do it well. Anyone tired of digging through a drawer of Tupperware looking for the base that matches the lid will notice the difference within days, since a bowl and a lid from this set always match by definition. It's also a solid pick if you already tried a cheaper stretch-lid set and got frustrated by inconsistent sizing, because these measured far more predictably than the off-brand set I compared them to.

If you want the fuller picture of how these hold up over a longer stretch of daily use, including the seal wearing in on the most-used sizes, that's covered in the long-term review. This one is specifically about whether the sizes actually fit the containers people already own, and for round dishes, the answer is yes without much hesitation.

Who Should Skip It

Skip this set, or at least don't expect it to solve everything, if your cabinet leans heavily toward square meal-prep containers or rectangular baking dishes. The 6.5-inch lid on a square container looked fine in a product photo and looked mediocre on my actual counter, gapping at the corners in a way that let air in and made the seal unreliable for anything beyond a day or two in the fridge. If most of what you store is a 9x13 casserole or a stack of square glass containers, you're better served by a matched set of lidded containers built for those exact shapes, or by keeping the plastic wrap around for the dishes silicone can't cover.

It's also not the right buy if you're specifically shopping for large-format coverage, a big stockpot, a wide skillet, a full casserole. The largest two sizes in this set are the weakest performers relative to what a dedicated lid or a sheet of foil would do, and buying the full 8-piece set mainly to solve a big-dish problem is likely to leave you disappointed in exactly the two lids you bought it for. And if you're the type who wants a printed size guide to measure against before you buy, know that this box doesn't include one. You'll be reaching for your own tape measure the same way I did, matching diameters by hand against whatever is already sitting in your cabinet.