Incredibly lightweight. I got the .6 liter, which holds almost the same amount as my Healthy Human 21 oz vacuum, but of course is not insulated. I haven't had any trouble with the screw on lid as some people have. It's very sleek looking, fits in my bike bottle cage and my car cup holder. I love that it's made in Switzerland. The brand is unobtrusive, so you don't feel like they should be paying you for advertising. I wish it didn't have a polymer lining but it's the closest I could find to harmless.