トゥーゴータンブラー 240ml/360ml/480ml シリコーンパッキン

I was a bit skeptical about buying just the gasket separately, but this one seals the 360ml tumbler so tightly that I can shake my iced coffee without a single drop escaping. The fit around that standard 70mm opening is precisely snug.

The new silicone gasket fits perfectly into my 360ml tumbler, and the seal is noticeably tighter than the old one. I've been using it for hot coffee every morning without a single leak.

I was pleasantly surprised by how snugly the silicone gasket seals my 360ml tumbler, not a single drop of coffee leaked on the way to work. The 4mm thickness fits perfectly into the lid's groove, making cleanup easier since nothing gets stuck in the edges.