Three-in-One
A three-piece nesting stainless bento with no gaskets at all - deliberately fully plastic-free (and, as a result, deliberately not leak-proof).
Plastic-free verdict: Plastic-free
All three nesting pieces (the two-level box plus a small snack pod) are food-grade stainless steel, and there are no gaskets, no silicone seals, and no plastic anywhere - ECOlunchbox states plainly that "container is not leak-proof since no plastic gaskets are used." That trade is the whole point: it stays 100% plastic-free by skipping the seal entirely. Genuinely plastic-free and silicone-free. For dressings or wet dips the brand points you to its silicone-lidded Seal Cups instead (those would be silicone-only).
Verification: Manufacturer confirmed · reviewed 2026-07-05
What it's made of
| Part | Material | Food contact |
|---|---|---|
| outer box + inner tray + snack pod food-grade stainless nesting pieces; brand markets as 18/8, some listings note a 201-series stainless - either way all-steel, no lining | Stainless Steel (304 / 18-8) | Yes |
| lid stainless lid with no gasket or seal of any kind; press-fit only, hence not leak-proof | Stainless Steel (304 / 18-8) | Yes |
A clever three-in-one: a two-tier stainless steel box whose lid latches by press-fit, plus a small stainless snack pod that nests inside. The defining feature is what's absent - there is no silicone gasket and no plastic frame, so nothing but steel touches food. The unavoidable consequence is that it isn't leak-proof; it's built for sandwiches, fruit, crackers, and dry-ish foods rather than soups or saucy dishes. It's light, packs down, and is one of the few genuinely 100%-plastic-free AND silicone-free lunch options on the market.
Pros
- Truly plastic-free AND silicone-free - no gasket, no seal, all stainless
- Three nesting pieces in one; light and compact
- Nothing to wear out or replace (no gasket to perish)
- Dishwasher safe
Cons
- Not leak-proof at all - no gasket means no wet foods
- Cannot go in the microwave
- Press-fit lid can pop if the bag is jostled
- For dips you must add a separate silicone-lidded Seal Cup
Notes
- Listing grades vary (18/8 vs 201-series stainless) but all pieces are all-steel with no lining
- Also sold in a larger "Gigantic" (49oz) size; same gasket-free, plastic-free design
- For wet foods, ECOlunchbox's Seal Cup / Splash Box lines add food-grade silicone lids (silicone-only)
Categories: Lunch Boxes · Food Storage Containers
Sources
Every material claim above is backed by these. This is the scattered info we centralized.
- manufacturer https://ecolunchboxes.com/products/ecolunchbox-three-in-one brand states 100% food-grade stainless, no silicone seals or plastic gaskets, and explicitly "not leak-proof since no plastic gaskets are used"
- manufacturer https://www.amazon.com/ECOlunchbox-Stainless-Canister-Regular-Childrens/dp/B0040MH642 listing confirms three-piece nesting stainless bento, plastic-free, non-toxic, dishwasher safe, "not leak-proof"