A hydration pack is a backpack or bag that holds water and allows you to drink it easily while doing outdoor activities like hiking or biking. Full definition
That's where these top - of - the line hydration packs with bite valves come into play. (creditdonkey.com)
The bag also provides tremendous comfort while going beyond most hydration packs. (creditdonkey.com)
Some of the best hydration packs start by holding one liter of water for runs and short hikes all the way up to three - liter packs for longer journeys on foot or bike. (creditdonkey.com)