トラベルタンブラー 350ml シリコーンパッキン（Bタイプ）

My old gasket had gotten a bit worn, so this replacement made my daily coffee commute leak-free again. The silicone feels denser than I expected, and it snapped into place perfectly.

Popped this into my tumbler this morning and it fit perfectly — no more coffee dripping onto my desk during the train ride. The silicone feels thicker than the original, which gives me more confidence it won't wear out quickly. Exactly what I needed to get my old tumbler back in action.

The old gasket finally gave out after daily use, and this one slid right into the 350ml lid without any fuss. It seals firmly when I flip it upside down in my bag, so no more coffee stains on my work tote.