Water is the most important thing on this planet (right behind hunting and oxygen) and the only thing you can find to carry it is a plastic bottle? Actually, there is no real problem with plastic bottles per say, it's their accessibility that is the issue. If you have to stop every time you drink, how often is it going to happen? Two or three times tops, and that is not enough. With Badlands hydration system, water is available at your fingertips without having to stop, which means you keep the fluid levels up and the energy level high.
The 100 oz. water bag is made to fit the Hyper Vent, Diablo, Ultra Day Pack Super Day backpacks.