Ideal travel companion to all travellers and outdoor lovers, the LifeStraw Peak Series Collapsible Squeeze Bottle (650 ml) personal water filter system allows you to collect, filter and purify water in an easy and safe way. This product features a sturdy and durable construction and offers a 650 ml capacity. Highly versatile, this water filter is collapsible and designed to be used for trail running, through hiking, limited space travel, cycling or fishing. It is the simple and compact option for your outdoor adventures.