Good Bag Hydration Backpacks Cycling Hydration Packs for 2.0L Hydration Bladder Bag Imported 2.0L water bladder Any twisting movement of the top of the hose may unscrew the bottom connection. Just make sure that you securely tighten the hose when you put it back into the bag as well as securely tighten the larger top filling cap Please tighten the hose fitting securely before each use Do not over fill the bag or tighten the straps on the bag too tight as this may increase the pressure in the bag and it may cause it to leak