I bought this 3 liter military-grade Camelbak as a replacement for the lighter 2-liter that came with my hiking day pack. I had used it with success while backpacking, but after running out of water on one long day I bought this one at the recommendation of my fellow backpackers. I have used it one one trip so far and am very pleased with it. It is very sturdy. I admit that I did like the shape of the mouthpiece for the other one a little better, but that's a minor inconvenience.
Most durable backpack reseirvoir ever, 90392 from Camelbak
This item is the best new thing i love about my camelbak, it is more durable than my last hydration system, the normal camelbak one, and it is very hardcore in toughness and materials, military spec it is, love it!