I’ve been using the Manta on day hikes and more recently while paddling my kayak. I am so impressed with the fit and function of this pack. I have been consciously trying to drink more water, and the Manta has been a great help while active. The ease of use is the biggest factor. I can easily fill it before heading out. I have used it numerous times, and have not noticed any ‘plastic’ or off taste. The reservoir is made by Nalgene, and is BPA and PVC free. The the AquaGuard anti-microbial formula is designed to prevent bacteria and mold from developing. This appears to be working because the reservoir has not developed any mold, and the water still tastes fine. Keeping the water clean and tasting good is the easiest way to keep me drinking it.