Though available in the US for some years, I've at last been able to obtain these bottles in the UK without extortionate mailing/import duty costs. The taste-free flexible body means the empty bottle takes up virtually no space in a rucksack & the wide screw cap allows easy cleaning & much easier filling (with the chance to add ice cubes in summer)- a combination offering big advantages over the other popular brands of quality drinks bottles currently available. I've delayed reviewing until the bottles have had a fair bit of use because a small number of US reviewers complain of "wear & tear" leakage at the join between the body & the collar (where the bottle flexes most). Mine have now had a lot of use & show no sign of leaks at the collar or at the screw lid. The lid has the same thread as Nalgene's non-collapsible bottles, so the product also fits onto several Nalgene-compatible screw-on water filters. To summarise, this bottle has significant advantages over the other quality folding water bottles available & I would not go back to the narrow-necked versions.