Tupkee
Tupkee's whole line is double-wall borosilicate glass paired with glass sip lids, positioning glass as the plastic-free way to drink hot coffee or tea. The drink path is glass; the only non-glass parts are food-grade silicone - the lid's leak seal, a grip sleeve, and a protective base disc. That makes the glass-lid models plastic-free in the contact path (silicone-only overall). Some larger boba/smoothie variants use a straw lid, which can reintroduce plastic.
How clear are their specs?
Clearly states borosilicate glass and lists the silicone seal, sleeve, and base, and the sip lid is confirmed glass on its own product page. But the main tumbler listings are vague about the lid material, and country of manufacture is not stated.
Lead testing disclosure
Tupkee's product pages only assert "lead-free" and "BPA-free" as bare marketing claims, with no named lab, no ppm/detection-limit figures, and no dedicated safety or testing page found.
- manufacturer https://tupkee.com/products/tupkee-double-wall-glass-tumbler-insulated-tea-coffee-mug-lid-hand-blown-glass-14-ounce bare "lead-free" claim with no lab name or numbers