I really like these bottles. I had to contact their customer service and they were great to work with too. I use the big one Visp (yellow) while I’m at home. I can make a big cup of iced coffee and protein, But on the days I’m on the run, I use my smaller Visp (blue). It fits into my cup holder and easy to use. But I love the fact that both have the silicone sleeve on it, which does protect it, help keep it cold and you get a good grip on a cold bottle. Great product and some of my friends agree.