We’ve conducted almost 70 hours of research into water bottles over the past five years and have now tested a total of 79 in all shapes and sizes. But because different people have different priorities, we couldn’t pick just one, so we’ve chosen our favorites across a broad range of materials and styles that include steel, insulated, plastic, glass, and collapsible bottles. (If you want a bottle to keep hot drinks hot, check out our guide to the best travel mug; for smaller bottles for smaller people, see our guide to the best kids water bottles.)