Rubbermaid Brilliance vs Glasslock: the best plastic against the best glass

The verdict

Two latches with vents vs four tabs with a gasket

Brilliance uses two latches on the short ends over a gasket, with steam vents under the latches. Rubbermaid's wording is "100% airtight, leak-proof seal and secure latches" and "built-in vents under the latches allow steam to escape so you can microwave food splatter-free, without removing the lid." The lids are universal across the Brilliance line — plastic and glass bases share them — and the plastic is Rubbermaid's StainShield, which the maker says is stain- and odor-resistant.

Glasslock uses four tabs, one per edge, over a removable silicone gasket. The distributor FAQ calls the seal airtight and leak-proof; Glasslock's own guidance is to never microwave with the lid closed, because the seal is complete and the pressure has nowhere to go. Four tabs clamp more evenly than two — a corner is less likely to lift on an overfull container — at the cost of four hinges instead of two.

Which room: microwave, oven, bag

Microwave. Brilliance, and it isn't close: the vented lid is designed to stay on. Glasslock says lid off. If you reheat five meals a week at a desk, that's five fewer splattered microwaves.

Oven. Glasslock's oven series (marked OVEN SAFE on the base) is rated to 230°C; Brilliance plastic isn't oven-rated at all; Brilliance Glass bases are rated to 450°F. If the meal is roasted vegetables you want crisp again, glass.

Bag. Brilliance plastic. It weighs a fraction of Glasslock and makes the same leak-proof claim. Glasslock in a backpack is a heavy backpack with a small chance of a chipped rim. The weight math, with the rest of the glass-versus-plastic argument, is on glass vs plastic.

Five years from now. Glasslock's glass will be unchanged; its gaskets aren't sold separately in the US, so a torn one means a new lid. Brilliance plastic will be clouded where it's been scratched; the maker's page didn't load for us, so we couldn't verify a replacement-lid program. Neither page publishes the warranty terms we'd want, which is one reason Snapware — lifetime lid warranty — keeps showing up on the overall ranking. Since we wrote this, the Brilliance set contents and care wording became readable through the listings Rubbermaid sells through, including a stated lifetime warranty on the plastic set — all of it, and the microwave instruction that differs between the plastic and the glass, is on our Rubbermaid Brilliance review.