Having your own reliable supply of water any time you go outdoors is essential, and for one of the most durable water packs you will find, get the Camelbak 100 oz 3.0L MG Long Neck Reservoir. This device comes with a Big Bite valve and a leak-proof screw-cap for easy water access. This device comes with the HydroLink, which includes a shut-off at the exit port. The Big Bite valve is made out of silicone, making it incredibly durable. This also allows water to flow with ease. Once you have used your Camelbak 100 oz 3.0L MG Long Neck Reservoir, the proper steps should be taken to clean it thoroughly. This will prevent mold and mildew from building up inside and potentially making you very sick. It is particularly important to clean it if you have filled it another substance other than water. After it has been cleaned, you should let it air-dry overnight, which prevents any moisture from getting trapped inside and allowing mold to develop. This device is built to be completely free of both BPA and BPS.