Tupkee Double Wall Glass Tumbler
Silicone is only a gasket/seal — what touches your food is Borosilicate Glass. And it sits in a hot path, where silicone matters more.
A hand-blown double-wall borosilicate glass tumbler whose sip lid is also glass - one of the few hot mugs with no plastic in the drink path, sealed only with food-grade silicone.
The verdict: Silicone only
The cup is double-wall hand-blown borosilicate glass, and - unusually - the sip lid is glass too, so both the vessel and the lid your coffee flows through are glass. The only non-glass parts are food-grade silicone: the lid's leak seal, a grip sleeve around the cup, and a protective base disc. So the drink path is glass plus a silicone seal - silicone-only, and notable because almost every other "glass" travel mug still tops out with a plastic lid. It is not fully plastic-free (the silicone seal is what keeps it from that), but there is no petroleum plastic anywhere your drink goes, which is genuinely rare for a lidded hot mug.
Verification: Manufacturer confirmed · Last reviewed
What it's made of
| Part | Material | Food contact |
|---|---|---|
| cup body (double-wall) hand-blown double-wall borosilicate glass; the outer wall stays comfortable to hold with a hot drink | Borosilicate Glass | Yes primary 🔥 |
| sip lid glass sip lid - brand states the "glass lid delivers a natural taste, without any plastic or metal aftertaste" | Borosilicate Glass | Yes primary 🔥 |
| lid seal FDA food-grade, BPA-free silicone seal that prevents leaking - the only non-glass part in the drink path | Silicone | Yes seal 🔥 |
| grip sleeve silicone band around the cup for a non-slip grip; exterior, does not contact the drink | Silicone | No |
| base disc silicone disc on the bottom that protects the glass; exterior, does not contact the drink | Silicone | No |
Tupkee's double-wall glass tumbler is a hand-blown borosilicate cup with a matching glass sip lid. The double wall insulates a hot drink so the outside stays comfortable to hold. It's a sip lid rather than a locking leakproof commuter cap, and being inexpensive hand-blown glass it's breakable - treat it as glassware rather than a rugged commuter mug. Sold in several sizes and colors, with the glass sip lid available separately so a cracked lid doesn't total the cup.
Pros
- Both the cup and the sip lid are glass - the drink never touches plastic
- Double-wall borosilicate insulates hot or cold while the outside stays comfortable to hold
- Inexpensive and widely available for an all-glass mug; sold in several sizes
- Glass sip lid is sold separately, so a cracked lid doesn't total the mug
Cons
- Thin hand-blown glass; breakable and less travel-rugged than steel
- It is a sip lid, not a locking leakproof commuter cap
- Larger boba/smoothie variants use a straw lid that can add plastic - stick to the glass sip-lid models for a plastic-free path
Notes
- Sizes: 8 oz, 14 oz, 20 oz; colors include Black, Jacaranda, Niagara, and Cyan
- The glass sip lid is confirmed glass on its own replacement-lid product page; the main tumbler listings are vaguer about the lid material
- Country of manufacture is not stated on the listings
- The 20 oz boba/smoothie version uses a straw lid; confirm the straw material if a plastic-free path matters
Categories: Travel Mugs & Tumblers
Sources
Every material claim above is backed by these. This is the scattered info we centralized.
- manufacturer https://tupkee.com/products/tupkee-double-wall-glass-tumbler-insulated-tea-coffee-mug-lid-hand-blown-glass-14-ounce hand-blown double-wall borosilicate glass tumbler sold with a lid; lists a silicone seal (leak prevention), silicone grip sleeve, and silicone base; marketed as BPA-free/all-glass
- manufacturer https://tupkee.com/products/tupkee-double-wall-glass-tumbler-replacement-lid-for-hand-blown-glass-travel-mug-14-ounce the sip lid is glass ("glass lid delivers a natural taste, without any plastic or metal aftertaste, lead-free") with an FDA food-grade, BPA-free silicone seal; sold separately as a replacement
- retailer https://www.amazon.com/Tupkee-Double-Wall-Glass-Tumbler/dp/B07DPFM3W7 retail listing for the 14 oz model; describes it as "All Glass Reusable Insulated Tea/Coffee Mug & Lid, Hand Blown"
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