there's not a lot to say here other than our nuun water bottles are made by specialized in the US and they are truly the best that money can buy. wideneck mouth, soft to the squeeze and with a stopper that is easy to open but seals when you need it to. simple really. and it's why these bottles are used by the best riders in the world
the 20oz bottle is about 500ml for those of us over here and, incase you're wondering, fill the bottle up to about the neck and drop in a single tab of nuun...that's about the right concentration
and a tip - leave the stopper open until the tab has dissolved...it's stops a "poof" when you unstopper it.