Do you have a backpack with space for 2 liter hydratation systems or more? Or does your current hydratation system needs to be replaced? Then the BBB Cycling Backtank BSB0105 is what you are looking for. The large opening, removable hose and anti-microbial material gives you the ability to keep the Back Tank BSB-105 clean. You can even turn it inside out to clean it even better and let it dry really well.