Review on UltrAspire x UltraFlask 550: Advanced Green Water Bottle for Optimal Hydration by Jacob Ashman

I have two of these bottles and use them all the time. They are good for running, traveling and camping as they are very light and have the perfect fit and also combine perfectly with other Ultraspire products. Having said that, I have to say that these are not always the safest of bottles as there are some issues with the rubber spout. If you don't press all the way down, the nozzle may leak water, and over time, the rubber mouthpiece may deform slightly, so if you don't hold the apex, water may drip very slowly. If you can deal with small leaks from time to time, it's worth the compromise.