I bought two of these -- one for my two dogs and one for myself. The quality of the plastic is high -- it's supple and strong. The seams are more secure than what I've seen on most collapsible water carriers, and that to me means I will be able to use these bags (they seem more like a bag than a "bottle" to me) for a good long time. The spout is secure and does not leak when closed and like the bag, the plastic is higher-quality than one would expect at this price. Highly recommend.