Customer Review: "Amazingly designed product. Easy to use, hygienic, great design, good filter quality. I wanted to use this when travelling through trains in sydney , as I wanted to avoid water from plastic bottles for two reasons 1) Suspect quality of water inside these bottles and 2) to shun Single use plastic bottles which are extremely harmful for the environment. Smartflast took away all my tensions, as I could fill it with water from the tap at stations, where water was not available. One bottle is sufficient for 1 person, as it is for 650 ml only. It is also easy to clean and very hygienic."