Made of 18/8 stainless steel and is BPA-free. Features double-wall vacuum insulation to keep drinks hot or cold for hours. Includes a pour-through stopper for controlled flow and an insulated lid that can double as a cup. The design is leakproof and streamlined for easy packing and carrying. 25 oz version Used gently, one dent on bottom but have only used a handful of times and don’t ever use anymore