A stainless steel tumbler can still use plastic in its lid, slider or straw and silicone in its gasket. Read the materials for each part and match them to how you carry and clean the cup.
The material of a travel cup’s body does not describe the whole assembly. A steel tumbler may have a plastic lid, a silicone seal, a plastic straw or a sliding closure made from another material. Check each part if you want to reduce plastic in the item you use every day.
Audit the whole cup
| Part | What to look for on the product page |
|---|---|
| Cup body | Stainless grade, coating and interior finish |
| Lid | Plastic type, steel, wood or other listed material |
| Seal | Silicone or another gasket material, and whether it is removable |
| Slider or stopper | Separate material and replacement availability |
| Straw | Steel, silicone, plastic or a mixed construction |
| Carry parts | Handle, base, bumper and any detachable accessory materials |
Klean Kanteen’s Tumbler Lid is one specific example: its product page lists BPA-free polypropylene #5, a removable silicone gasket and a splash-resistant press-fit design. The maker also says this lid is not leakproof and names the tumbler models it fits. Those details apply to that accessory, not to every stainless cup.
Match the lid to how you use the tumbler
- Decide whether you need a lid for carrying, sipping at a desk or drinking through a straw.
- Read the material list for the body and every part of the lid.
- Check whether the lid is leakproof, splash-resistant or open at the drinking hole.
- Compare the exact fit list before ordering a replacement lid.
- Check whether the gasket and slider come apart for cleaning, and follow the maker’s care directions.
Terms such as BPA-free do not mean that a part contains no plastic. Likewise, a steel straw does not tell you what the lid or seal contains. Use the complete materials list rather than a single headline label.
Compare cup materials with our plastic-free water bottle guide. For another reusable kitchen material, see what to check on stainless food containers. Browse drinkware and water.
Sources
Common questions
Can a stainless steel tumbler have a plastic lid?
Yes. A steel body does not tell you what the lid is made from. Check the product's parts list and the separate replacement-lid page.
Are tumbler gaskets made of silicone?
Some are. For example, Klean Kanteen lists a removable silicone gasket on its Tumbler Lid page. Check the exact lid model.
Does BPA-free mean plastic-free?
No. A BPA-free statement addresses a specific chemical claim. It does not mean the part contains no plastic.
How can I buy a replacement lid that fits?
Match the lid's exact compatibility list with the size and product name of your tumbler. Similar capacities do not guarantee fit.