I remember using first generation hydration Camelbak's back in the 90's. Over that time span and currently this has to be the best most efficient bladder I have ever used. The bladder is really strong, the flex of the material makes it very maleable. The design is very user friendly, filling from the top is really simple, and closing it back up is so much easier than bladders of the past. The function I like the most about this bladder is the quick connect for the tube allows you to disconnect the bladder from the tube when you have your bladder run around your pack or through a shoulder sleeve without it leaking. This is an awesome feature and if you are like me, that is always the biggest pain when refilling. Other than that, the connecters can be tough to clean and I wish Salomon made more sizes because a 2 liter or even a 3 liter would come in handy at times. Highly recommended.