Featured in The Unplastic Shop, curated with the producers of The Plastic Detox to reduce your daily exposure to microplastics.
The EcoLunchBox Seal Cup Medium features a stainless steel container with a blue, round, wavy-textured silicone lid. Both leak-proof and airtight, it’s a reusable, plastic-free lunchbox—perfect for storing food on the go. Text graphic reads: The Unplastic Shop. Curated by the Oceanic Preservation Society — the production team behind The Plastic Detox, now streaming worldwide — to reduce plastic exposure where it matters most. The EcoLunchBox Seal Cup Medium is a stainless steel container with a blue silicone lid, labeled “12 oz. 1 1/2 cups,” making it an ideal plastic-free lunchbox for meals on the go, shown on a white background. The EcoLunchBox Seal Cup Medium is a round blue silicone lid with a raised wavy pattern, designed to fit your stainless steel container. Photographed on a white background. Two round EcoLunchBox Seal Cup Medium stainless steel containers are stacked next to two blue silicone lids on a white background. These leak-proof, plastic-free lunchbox containers offer flat-fitting lids beside them.
Beyond Plastic No Single Use Plastic
The EcoLunchBox Seal Cup Medium features a stainless steel container with a blue, round, wavy-textured silicone lid. Both leak-proof and airtight, it’s a reusable, plastic-free lunchbox—perfect for storing food on the go.

EcoLunchBox Seal Cup™ Medium - Leak-Proof Snack Container

12 oz

Why we love it

  • Free from 3,000+ banned ingredients and meets our EU-informed standards.
  • Durable stainless steel container with a silicone no-leak lid.
  • Designed to celebrate oceans and reduce pollution dependency.
  • Versatile and non-breakable container for everyday use.
$15.00 $15.00 Save 0%

Seal Cup™ Medium - Leak-Proof Snack Container $15.00

Free carbon neutral shipping on orders $29+. Arrives in 3–5 days. Free, easy 30-day returns.

Enjoy the convenience of a leak-proof container without any plastic. Our ECOlunchbox Seal Cup Medium is a versatile, durable stainless steel container with no-leak silicone lid in blue embossed with a wavy sand design.

The Seal Cup Medium is part of our Blue Water Bento collection of containers designed to celebrate our oceans and inspire us all to reduce our dependence on plastics that are polluting our planet. The durable and non-breakable containers all feature colorful lids embossed with ocean motifs.

Product Details:

  • No-leak stainless steel container with silicone lid holds 12 oz. (1.5 cups)
  • Container measures 4 inches in diameter by 2 inches tall
  • The container is made from food-safe 18/8 stainless steel 304 with a no-leak silicone lid
  • Container's space-saving design nests and stacks for compact storage
  • Tare weight is etched on the bottom so food container may be used for bulk shopping and at prepared food bars. Two weights are provided - for the base of the container alone as well as with the lid on it
  • All parts are dishwasher and oven safe
  • Not for use in the microwave
  • This steel and silicone container is lighter than glass containers and non-breakable

Container: Food-Safe 18/8 Stainless Steel 304 No-Leak Lid: Silicone

All parts of this large lunchbox are dishwasher and oven safe. Not for use in the microwave

Grove Values

More from The Unplastic Shop

Shop The Unplastic Shop
A collection of eco-friendly household items including a metal lunchbox, reusable bamboo utensils, toothpaste tablets, bamboo toothbrush, dish scrub, cleaning cubes, dish soap, and colored pencils, all arranged on a wooden board.
The unplastic shop

Curated to reduce plastic exposure where it matters most

Everything in this shop meets expert-backed criteria developed with the Oceanic Preservation Society — prioritizing reduced plastic where it counts most.

✓ Plastic never touches anything you ingest

✓ Free from BPA and all “BP” alternatives

✓ Free from PFAS and other “forever chemicals”

✓ Selected to avoid endocrine-disrupting chemicals (EDCs) and other chemicals associated with hormone disruption

Download the Standards
A flat lay of powdered ingredients, gummy candies, a glass of pink liquid, a gold spoon with powder, and a container with an orange slice label, all on a pastel green background.

Grove Collaborative

10,000+ ingredients reviewed. 3,000+ banned outright.

Our most comprehensive standards yet — across your whole home.

Explore Our EU-Informed Ingredient Standards