Insulated drinkware is generally durable and the vessel is rarely what goes wrong. The failure is nearly always at the lid, and it is nearly always cleaning rather than manufacturing. Where Residue Collects The silicone gasket, and specifically underneath it. The threads on the lid and the vessel. Inside a sliding or flip mechanism. And along the inside of a straw. None of these are reached by rinsing, which is why a tumbler that looks…
"Lids, Straws and the Parts That Fail First"