Using your CamelBak Crux 3L Reservoir is simple. First, open the bladder using the easy - to - operate cap. Fill it up with water through the ergonomic handle area. After filling, close the cap tightly to prevent any leaks. When you're ready to drink, just turn on the on/off lever and take a sip. You'll notice you get 20% more water with each one. As for maintenance, empty the reservoir after each use and let it dry thoroughly. Make sure to keep it in a cool, dry place. Also, remember that since it's free of BPA, BPS, and BPF, it's safe for you. Just avoid dropping it from a great height or subjecting it to extreme temperatures, as this could potentially damage the reservoir.