So my wife brought me a life adventure thermo cup that I had seen being used before on YouTube by other bishcrafters. First impressions were great. Fantastic build quality. All apart from the lid it has a short plastic thread to secure it to the fully stainless cup. It just pops back off once tightened down. I wouldn't trust it not to leak in a bag. Real shame . So I am now looking for a thermos flask. I want it to be 100% stainless no plastic Shiite anywhere at all. Anyone got something they can recommend?