The camelbak stealth military hydration pack ensures there is always room for water the reservoir is extremely secure when drinking from it ideal for any activities where you need you hands to be free but your in need of hydration throughout your day the stealth hold up to two litres of liquid and is designed to make filling the pack easy without having to take out the reservoir out of the pack the camelbak pack features a large mouth opening made for easy and quick filling when on the go