Nah, This is just a common misconception. The battery life is pants on some phones and this also depends on what you have installed, what services and what apps are running in background. It's how you run your device and all subjective. Viewranger/GPS in on itself uses very little power. When out and about and you want to use Viewranger or any other type of GPS navigation/mapping etc and have as much battery as possible dedicated to this then you need to take command of phone and disable other things. Turning airplane mode on isnt enough as background services will still continue to run and attempt to connect/use signal etc. There are plenty of apps that can help you disable as much as poss but or you can do it manually within apps settings. Phones like Samsung also come with power saving modes built in or you can install a custom kernel to save even more power. Unless you have a ****ty iPhone then you're pretty much screwed. Best you can do it turn airplane mode on and use an external battery and charge if/when needed. Yes but that is a dedicated filter. The Travel tap doubles up as your water bottle and is excellent for quick/easy drink as you can just dunk it in stream/pool/puddle etc and drink straight from it. You can use the Sawyer as straw but much quicker to just fill up bottle and carry on. Previously I have used the Tap as my main drinking bottle and the sawyer simply for base camp water collection/filter. You could also use the Tap for this but you can damage the thread if you squeeze too hard or for too long. I hear ya. Just depends on meal though to me.