I had this made by a local lady. I do not know the brand of the tumbler but it keeps things cold for many, many hours. I still find ice in it the next morning. I like to fill it with soda during the day or water at night.
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I also bring my own stainless steel straw to use in the dining rooms with my iced tea. I also bring a brush to clean the straw and it is no big hardship. The cups at the drink station are flimsy, don't keep anything cold, there are no straws or lids so I bring my own tumbler.
MJ