Packable, light, and durable
These [2L model] weigh about 1/5th of a Nalgene 1L and hold twice the water. You can keep them rolled if you are packing them in, or roll them up once they are empty, which saves on pack space. The material used for the bottle is very malleable, but retains a high level of durability. Any indents or scratches can be covered with McNett Tenacious Tape to prevent puncture. The only potential downside is the narrow mouth, when compared to a wide mouth Nalgene. They also work well in conjunction with the Sawyer Squeeze filter, and other gravity filters. Great purchase in my opinion.