So I buckled and bought a couple of polycarb bottles, because of the markings, so I don't have to take a seperate measuring cup in my pack. But can't I add those markings to the Gatorade bottles, which are light, flexible so they can be frozen for those midsummer hikes, and which have wide enough mouths to come clean in the dishwasher? Obviously unbreakable, not just shatter resistant. Plus when you first get the bottles, they're filled with something that keeps me hydrated very well, although it's not the best for your teeth. Someone remind me why I spent too much for polycarbs again?