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Stainless Steel Seal Cup

(3 customer reviews)

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  • Phthalate Free
  • BPA Free
  • Safe & Fair Labor
  • Sustainable Lifestyle

Phthalate Free

Phthalates are found in toys, electronics, personal care products, plastic wraps, containers, and more. These petroleum based chemicals help soften plastics, and bind fragrances to perfumes, deodorants, creams, and other personal care products. Phthalates are are not chemically bound, meaning they can easily get released into the air, water, or your body, just by using the products as intended. Phthalates have been found to disrupt the endocrine system, which can cause reproductive damage, hormonal imbalances, infertility, mood changes, metabolism changes, and more.

BPA Free

Products that are labeled as BPA free do not contain Bisphenol A, a chemical commonly found in plastic products. Studies on BPA exposure have shown that high levels of BPA could lead to hormone disruption, effects on behavior and brain function, reproductive problems, breast cancer, heart disease, infertility, and more.

Safe and Fair Labor

We support safe and fair labor practices when producing sustainable products. This company cares for their workers by fostering a safe work environment and providing their employees with fair wage.

Sustainable Lifestyle

This product helps promote a more sustainable lifestyle. Whether it encourages re-use and the movement away from disposable products, or it promotes sustainable actions like recycling and composting, this product can help you lower your environmental footprint.

Plastic-free, reusable, and leak-proof, the Seal Cup collection from ECOlunchbox is a versatile assortment of food storage containers that are inspired by the ocean with their uniquely designed lids. Each stainless steel container is dishwasher safe, comes with a silicone lid, and is perfect for packing meals and snacks to-go. The various sizes nest within eachother to save storage space and can hold all types of food from dips and dressings to bagels and berries.

Also from ECOlunchbox:

Sustainability Features


  • Container: Stainless Steel 304
  • Lid: Food-Grade Silicone

End of Life

  • Metal container recyclable with stainless steel collections

Earth Friendly Features

  • ECOlunchbox annually offsets the carbon dioxide (CO2) equivalent of 4.7 million pounds of coal burned
  • Durable, reusable products reduce the reliance on single-use plastics


  • Ships in packaging made with recycled content
  • All shipping packaging is recyclable

Made Without

  • Plastic-free
  • BPA, BPS and Phthalate Free

Product Specifications

Product Care

  • Dishwasher safe, or hand wash

Additional Features

  • 100% non-toxic stainless steel food storage containers
  • All parts are dishwasher and oven safe
  • Durable, non-breakable, and great for traveling
  • Designed to stack with other ECOlunchbox containers
  • Leak-proof
  • Freezer Safe

Product Dimensions

  • Mini: 2 5/8" diameter, 1 1/2" tall
  • Solo: 3.5"diameter, 1 7/8" tall
  • Medium: 4.1" diameter, 2.1" tall
  • Large: 4.75" diameter, 2.25" tall
  • XL: 6" diameter, 2.75" tall
  • Jumbo: 7" diameter, 3" tall


  • Mini: 6 oz. / .75 cup
  • Solo: 7 oz. / 7/8 cup
  • Medium: 12 oz. / 1.5 cups
  • Large: 20 oz. / 2.5 cups
  • XL: 28 oz. / 3.25 cups
  • Jumbo: 48 oz. / 6 cups


  • Unused, undamaged products in their original product packaging can be returned within 30 days


  • Tare weight displayed on bottom for easy usage

Shipping Info

  • Ships within 1 business day

About the Company


ECOlunchbox believes in a simple concept: nutritious and delicious lunches should be packed in non-toxic containers and fill your bellies, not the garbage can. With their collection of dishwasher safe, stainless steel food storage containers and cotton lunch bags, itโ€™s easy to ditch the plastic tubs, one-time baggies, yogurt squeezers, and wrapped snacks. That means less waste on the environment, and a healthier, non-toxic lunch for you!

Founder and mom-on-a mission, Sandra Ann Harris, believes that the best way to reduce waste is to not create it in the first place. By offering reusable alternatives to everyday lunchbox items, ECOlunchbox helps people to move beyond using plastics, one meal at a time.

Learn More


Share your thoughts!

5 out of 5 stars

3 reviews

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What others are saying

  1. Question


    Are these plastic free? Iโ€™m guessing not since it doesnโ€™t say that. I also really want to know if you can buy each individual size so the amount suits your needs.

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    • EarthHero


      Hi Kiya! These are plastic-free. We list all materials below each product under “Sustainability Features”. For this particular item, the body is stainless steel while the lid is Food-Grade Silicone. You may purchase any size you’d like by selecting from the dropdown menu to the right of the product. ๐Ÿ™‚

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  2. genevievethegrand

    Great little container for dips

    genevievethegrand (verified owner)

    I bought the mini cup and it’s great for taking hummus, peanut butter, or other little dips to work. I’ve not had issues with it spilling, it’s easy to clean, and overall it’s easy to just throw in my lunch bag. Would recommend!

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  3. kariberry75

    Great snack cup

    kariberry75 (verified owner)

    I LOVE these containers. They are perfect for my kids lunches. I can put enough of each food item to keep them satisfied at lunch. I have used them to carry peanut butter crackers, crackers, fruit, shredded cheese, etc (my daughter said the cheese stayed cold when I put the container next to a freezer pack). I have purchase several more since then. I love that they can go in the dishwasher. They get completely dry in the dishwasher, better than the Stasher packs, which is what I need in the morning when I have to pack three lunches.

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  4. Question

    Sarah L Duncan

    I’m wondering if these will work in the freezer? I want to make food ahead of time, and freeze it in one and two person serving size containers. Thanks!

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    • EarthHero

      Admin EarthHero

      Hey Sarah,

      Great question! Here’s what ECOlunchbox recommends regarding freezing in these storage cups:

      “The silicone lids are freezer safe, but beware because it’s risky to freeze in our steel containers. Liquids swell when frozen and if the steel container is overfilled the freezing will split the steel.”

      Hope that helps! We recommend using full silicone containers for freezer storage, like these Stasher bags!

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