Materials & Prop 65
Last updated November 10, 2026
What each RIME product is made of, as the maker describes it, what we are still confirming, and California’s Proposition 65. Our product pages describe each part as the maker describes it, and say so. What we are still confirming in writing is listed on this page. We do not fill a gap with a guess. How to use and clean each product safely is on our Use & Safety page.
On this page
Where things stand
- Materials: we describe them as the maker describes them: a body of double-wall, vacuum-insulated stainless steel with a coating in the color on the outside, plastic lids and straws, and silicone seals. The table below lists them, product by product.
- Our checks: we are collecting, from the maker, written confirmation of the materials and the construction of each product, and lab reports for our own units, not for similar products sold by others. They cover food contact, the sealing material under the base, the coating and Proposition 65.
- Proposition 65: no Proposition 65 warning is printed today, because none has been determined for our products. If the maker’s lab report for our units requires one, we will add it.
- No “free of” claims: we do not describe any product by a chemical it does not contain, on this website or on our packaging.
- No environmental claims: we make none, about our products or their packaging.
- Orders: the shop does not take orders yet. As the maker’s answers and the lab reports come in, we publish them here and on the product pages.
What each product is made of
The middle column is the maker’s description. The third column is what we are collecting in writing from the maker, or measuring ourselves. Once we have it, we publish it on the product page and on this page.
| Product | Materials, as described by the maker | Being confirmed |
|---|---|---|
| Daily Tumbler 40 | Body of double-wall, vacuum-insulated stainless steel, with a coating in the color on the outside and a brushed steel band at the rim. Clear plastic lid with a plastic cover that turns. Plastic straw. Silicone seals. A side handle with a soft grip insert. | The grade of the steel and its certificate; the coating; the plastic of the lid, the cover and the straw; the material of the seals, the handle and its grip insert; the sealing material under the base; whether the lid presses on or screws on; which parts can go in a dishwasher; the measurements. |
| Flip Tumbler 30 | Body of double-wall, vacuum-insulated stainless steel, with a coating in the color on the outside and a brushed steel band at the rim. Plastic lid, spout and carry handle. Plastic straw tube. Silicone seals. | The grade of the steel and its certificate; the coating; the plastic of the lid, the spout, the handle and the straw tube; the material of the seals; the sealing material under the base; whether the straw tube and the spout come off for cleaning; which parts can go in a dishwasher; the measurements. |
| Snap Tumbler 40 | Body of double-wall, vacuum-insulated stainless steel, with a coating in the color on the outside and a brushed steel band at the rim. Clear plastic lid with a tinted plastic cover. Plastic straw with a soft mouthpiece. Silicone seals. A side handle. | The grade of the steel and its certificate; the coating; the plastic of the lid, the cover and the straw; the material of the mouthpiece, the seals and the handle; the sealing material under the base; whether the straw comes out for cleaning; which parts can go in a dishwasher; the measurements. |
| Flip Bottle 24 | Body of double-wall, vacuum-insulated stainless steel, with a coating in the color on the outside. Plastic lid, spout and carry loop. Plastic straw tube. Silicone seals. | The grade of the steel and its certificate; the coating; the plastic of the lid, the spout, the loop and the straw tube; the material of the seals; the sealing material under the base; whether the spout and the straw tube come off for cleaning; which parts can go in a dishwasher; the measurements. |
| Shaker Bottle 20 | Body of double-wall, vacuum-insulated stainless steel, with a coating in the color on the outside. Tinted plastic lid, tethered cap, carry loop and storage base. A mixing strainer. Silicone seals. | The grade of the steel and its certificate; the coating; the plastic of the lid, the cap, the loop and the storage base; the material of the strainer, the seals and the disc that closes the storage base; the sealing material under the base; how much the storage base holds; the marks inside the bottle; which parts can go in a dishwasher; the measurements. |
| Slim Bottle 20 | Body of double-wall, vacuum-insulated stainless steel, with a coating in the color on the outside. A top piece of single-wall stainless steel with a plastic threaded collar and a seal. A small screw cap. | The grade of the steel and its certificate; the coating; the plastic of the collar; the material of the seal and of the cap; the sealing material under the base; whether it can be used with hot drinks; which parts can go in a dishwasher; the measurements. |
| Food Jar 14 | Jar of double-wall, vacuum-insulated stainless steel, with a coating in the color on the outside and brushed steel bands at the top and the base. A screw-on lid with a brushed stainless steel outside. A spork with a stainless steel head and a plastic handle, held in a plastic bracket. A silicone seal. | The grade of the steel and its certificate; the coating; what the inside of the lid is made of and how it is built; the steel of the spork head and the plastic of its handle; whether the spork folds; the plastic of the bracket; the material of the seal; whether the lid has a valve; the sealing material under the base; which parts can go in a dishwasher; the measurements. |
| Commute Mug 12 | Mug of double-wall, vacuum-insulated stainless steel, with a coating in the color on the outside and a wide brushed steel band at the top. Plastic sip lid and plastic cap with a carry loop. Silicone seals. | The grade of the steel and its certificate; the coating; the plastic of the sip lid and the cap; the material of the seals; the sealing material under the base; which parts can go in a dishwasher; the measurements. |
| Flip Top Mug 12 | Mug of double-wall, vacuum-insulated stainless steel, with a satin coating in the color on the outside and a thin brushed steel ring under the lid. Plastic lid with a flip-up tab. Silicone tab edge, foot pad and seals. | The grade of the steel and its certificate; the coating; the plastic of the lid; the silicone parts; the sealing material under the base; which parts can go in a dishwasher; the measurements. |
| Camp Mug 12 | Mug of double-wall, vacuum-insulated stainless steel, with a coating in the color on the outside and a broad brushed steel band at the rim. A clear plastic press-on lid with a small tinted tab. A loop handle. | The grade of the steel and its certificate; the coating; the type of plastic of the lid; the material of the handle; the sealing material under the base; which parts can go in a dishwasher; the measurements. |
Every product is imported. We are confirming the country of origin of each one with the maker. It must be marked on the product or its packaging, as US customs rules require, and we will tell you on request.
Stainless steel
The maker describes the body of each product as double-wall, vacuum-insulated stainless steel: two walls of steel with a vacuum between them. That is how the body is built, not a promise: we publish no insulation time until a test of our own units gives one.
We are collecting the grade of the steel, with a certificate or a lab report for our own units, and we give no grade until then. We make no other claim about the steel either. The same goes for the single-wall steel top piece of the Slim Bottle 20, the brushed steel top of the Food Jar 14’s lid and the steel head of its spork.
The base of a vacuum-insulated cup
To make the vacuum between the two walls, the air between them is drawn out and the opening is sealed. On some vacuum-insulated cups, this seal is made under the base with a small amount of sealing material, and it is covered by a cap or a plate that must stay in place, so that the sealing material stays covered.
We are asking the maker how our products are sealed and which sealing material they use, with a lab report for our own units. We will publish the answer here. Until then, and always:
- never remove, pry, drill or cut the base cap or the bottom of a cup;
- stop using a cup whose base cap is loose, cracked or missing, or whose bottom is dented or damaged, keep it out of the reach of children, and write to us;
- do not pass on to anyone else a cup you stopped using for this reason.
If this happens within 30 days of delivery, it is a defect, and we replace or refund the product: see Defective, damaged or wrong items. After that, please write to us anyway. See also Dents, cracks and the base.
The color coating
The color of each product is a coating on the outside of the steel. It is not in contact with the drink, which touches the inside steel wall, the lid, its seals and the straw. What the coating is and what it is made of are being confirmed with the maker, and the lab reports we are collecting for our units cover the coating too. Until then, we call it a coating and nothing more.
Wash the outside with a soft sponge and warm soapy water, without scouring pads or harsh cleaners. If the coating chips, cracks or flakes, stop using the product and write to us.
Plastics and seals
The lids, covers, spouts, straws, caps, carry handles and loops, the threaded collar of the Slim Bottle 20, the bracket and the spork handle of the Food Jar 14, and the storage base of the Shaker Bottle 20 are plastic, and the seals are silicone, as described by the maker. We name no plastic type until it is confirmed in writing for our own units. We are collecting the type of every plastic and the material of every seal. Where the maker’s description does not say what a part is made of, such as the side handles of the Daily Tumbler 40 and the Snap Tumbler 40, the handle of the Camp Mug 12, the mouthpiece of the Snap Tumbler 40, the cap of the Slim Bottle 20 and the strainer of the Shaker Bottle 20, we say nothing about it until it does.
Where a seal lifts out to wash, put it back in its groove, the way it came out, before you use the lid again, and stop using a seal that is torn, cracked or out of shape.
Food contact
Every part that touches a drink or food, such as the inside steel wall, the lid and its seals, the straw, the spout, the mouthpiece, the strainer, the storage base and the spork, must meet the US Food and Drug Administration’s rules for materials that come into contact with food, in Title 21 of the Code of Federal Regulations. We are collecting the maker’s written statement that every such part of our own units meets those rules, with the test reports behind it. We will publish it, product by product, once we have it.
Our checks and what is still pending
| What we are collecting | Status |
|---|---|
| The maker’s written description of the materials and construction of each product | Being collected |
| A certificate or lab report for the stainless steel of our own units | Being collected |
| The maker’s written statement, for our units, that every part that touches drinks or food meets the FDA food-contact rules | Being collected |
| How the vacuum of each product is sealed, which sealing material is used under the base and how it is covered | Being collected |
| What the outside coating is and what it is made of | Being collected |
| The type of every plastic part and the material of every seal | Being collected |
| A written statement, part by part, of any intentionally added chemical that California’s cookware disclosure law asks us to list for products that hold food or drink, and of any intentionally added PFAS, which some state cookware laws restrict | Being collected |
| Lab reports for units of our own products, covering the chemicals listed under California Proposition 65, for the steel, the coating, the plastics, the seals and the sealing material under the base | Being collected |
| Which parts of each product can go in a dishwasher | Being collected |
| An insulation test of our own units | Being collected |
| The measurements of each product | Being collected |
| The country of origin of each product | Being collected |
We publish a result only once we have it in writing, for our own units. We do not borrow another seller’s documents, and we never describe a product as having passed a check that is still pending. We do not hold any certification for our products, and we do not claim one.
California Proposition 65
California’s Proposition 65, in plain words, asks businesses to give a clear and reasonable warning before they expose people in California to a chemical on the state’s list of chemicals known to cause cancer, birth defects or other reproductive harm, unless the exposure is low enough that no warning is needed. The list is kept by the State of California and has hundreds of chemicals on it, some of which can be found in the metals, coatings, plastics and sealing materials of everyday products.
No Proposition 65 warning is printed on our pages or on our packaging today, because none has been determined for our products. We are collecting the maker’s lab reports for our units to find out. If a lab report shows that a product needs a warning, we will add it to that product’s page, where you see it before you buy, and to the product or its packaging, before we sell that product.
No “free of” claims
We do not describe any of our products by a chemical or a group of chemicals it does not contain, on this website, in our e-mails or on our packaging. Until the lab reports for our units are in, we make no claim about the chemical content of our products at all. When the reports arrive, we will publish what they say, in plain words, and only for the units they cover.
No environmental claims
We make no recycled, recyclable or other environmental claim about our products or their packaging. The Federal Trade Commission’s Guides for the Use of Environmental Marketing Claims ask that any such claim be clear and backed by reliable evidence, and we have none for our own units.
At the end of its use: take the lid, the straw, the seals and any other parts off, and follow the rules of your city or county for household items made of metal and of plastic. Packaging follows your local rules too. Keep plastic wrapping away from babies and young children until it is gone.
Asking for the documents
You can ask us for what we have received for any product: the maker’s description of its materials and, once we have them, the food-contact statement and the lab reports for our units. E-mail contact@rimecups.com with “Materials” in the subject line and the name of the product. We reply within 2 business days, send you what we can share, and tell you plainly what is still pending.
If something on this website does not match the product you received, or you see a claim you think we should not make, please tell us too. We correct it.