I've been using the GLASS WATER BOTTLE daily for a few weeks and the glass and Stainless steel contact with water is exactly why I chose it. The non-slip sleeve protects it well and the paracord carry loop is handy on walks. It's 100% leakproof so far, and the thread on the inside makes drinking smooth. Remember to hand-tighten the lid only; I overtightened once and it was stiff. BPA free is a plus.