This lightweight collapsible flask keeps your water cold 2x longer without the extra weight and bulk of traditional insulated bottles the quick stow chill fits snugly in the front pockets of all camelbak running vests and collapses for easy storage once it39s empty the extra wide mouth also makes it easy to refill on the fly especially if you39re adding ice or drink mixes and our classic one piece silicone bite valve offers a durable user friendly drinking interface the quick stow chill conv