There are dozens of good reasons to stop using disposable plastic water bottles: cost, environmental impacts, health dangers like the leaching of chemicals into your drink, etc.
It was only until recently that a product that is such convenient for long distance or trail runners has become available. Enter in your search Collapsible Soft Flask, a compact and reusable way to stay hydrated while running or traveling. These water bottles take up minimal space in your pack or pocket when empty, and their flexible designs shape to your hand and body, so they will never be unwieldy when being carried.
Stow a couple in a hydration vest, carry one in your hand, or just hook a line of them to your utility belt until it looks like you’re a well-hydrated Batman—you’ll never have to buy a single-use plastic bottle again.