Xactly Hydrogen bottles are great!
Prior to this order I only had the Chub size bottles. But I couldn't resist putting a bundle in my cart. Not because I really needed them, but because they just looked so awesome.
So I discovered that the hydrogen bottles, both larger sizes have interchangeable screw caps with the Chub. I love that I don't have to worry about which one goes to which. THEN, I realized that the screw part to open for the wide mouth was the same on both the medium and large bottle. Even better!! If I leave it overnight, there is still ice the next day! I got the stainless and really love them. And, remember I said I didn't really need them. Well, I am drinking way more water and won't leave home without my Hydrogen Bottle. So I did need them after all.
PS: the medium bottle fits in my vehicles' cup holders.