Your old Tupperware is fine. Silicone bags are for the plastic you throw away.

Silicone lunch bags are a legitimately good eco upgrade — but they’re competing with Ziploc and cling wrap, not with the plastic containers you already own.

The environmental math is simple: the worst plastic is the single-use kind. Sandwich bags, snack bags, plastic wrap, takeout containers. One silicone bag can replace hundreds of those over a few years of work lunches. That’s a real win, and it’s the main reason to buy one.

Against a reusable plastic container, silicone doesn’t win automatically. A Tupperware that’s been in your drawer since 2009 has already paid its environmental debt — keeping it is greener than buying anything new, including a fancy silicone bag. So don’t toss your containers to “go green.” Silicone is for the moments where you’d otherwise grab something disposable: packing snacks, marinating, carrying wet or messy food.

Honest caveats: silicone isn’t biodegradable and most curbside recycling won’t touch it, so end-of-life is a real question. It also stains and holds onto odors — curry in a silicone bag is a commitment. And cheap knockoffs sometimes use fillers that crack or worse. Buy 100% food-grade silicone from a brand that publishes test results.

Use what you’ve got, and buy silicone for what you’d otherwise throw away.