“Healthy Human steins really keep liquid cold for 24 hours or more. I often still have ice after 36 hours. Not sure about keeping liquid hot because I've never used it for hot liquid. Healthy Human customer service is very good as well. I had a previous stein lose its vacuum seal within the first year and they quickly sent me a new one. I also like the flipNSip lid a lot, though it does cost extra, but I think it's worth it.”
