After discovering ThinkBaby’s new line of bottles and cups I stumbled on their stainless steel sport bottles. I fell in love instantly. The spout is the perfect size opening. I always hated those wide neck Nalgene’s because I inevitably spilled water all over myself when using it. (Not to mention possibly ingesting BPA in the process). The bottle has a double walled vacuum sealed stainless steel construction so it keeps cold liquids cold and I assume hot liquids hot for longer periods of time. I take it everywhere I go. I drag it around by it’s little strap. Click here to read the full review.