I used this reservoir for 9 months of backpacking around south america, and really liked it. It's easy to clean, easy to slide open and close, I like that the hose snaps on and off so that it's compatible with the Katadyn water filter (yay for not company specific design!), the bite valve doesn't fall off easily like Camelbak's, and the rigid back makes it easier to slide into a full backpack. Yes, it takes some finagling, but it fits into both my daypack and large backpacking pack. The only reason I'm not using it right now is that the O-ring popped off when I was taking it out of my backpack in the amazon, and I couldn't find it. Once I replace it, I'll start using it again.