I am constantly looking for the best bang for my buck and I have to say that I have struck gold finding this Bottle.
The thick plastic ensures that You will not accidentely break the bottle while it is in Your bag which could potentially fall down a rock face, and if it did, I can guarantee that there will be no spills. The Big bite valve is very robust and doesn't allow any fluid to leave the bottle when not in use.
The build of the bottle is overall is made from high quality BPA free plastic and doesn't have that cheap plastic feel You get with common water bottles.
I would recommend this to anyone as I have found no problems with it so far.