I keep seeing people use a stainless steel tumbler with lid and it makes me wonder if it's better than a normal cup. Does a stainless steel tumbler with lid (https://spiritualsootsayer.com/collections/custom-double-wall-tumbler) keep drinks hot or cold longer or does the lid just help stop spills? Some people say it's great for school and travel while others think it's heavy to carry. If you use a stainless steel tumbler with lid every day will it really make things easier or just add extra weight? I'm curious!