Having used the Water-to-Go bottle I have been really impressed. It is a great shape and I like the indentation in the bottle as it makes it much easier to grip. This bottle is easy to open and does not leak. It is great that you can also remove the very effective filter and use it as a drinking bottle for drinks other than water making it very flexible, especially as it means I do not need to have more than one bottle. All in all, I shall definitely be recommending Water-to-Go to my friends and colleagues.