Review on Pure Solid Copper Water Bottle: Handcrafted Indian Traditional 100% Leak-Proof Pitcher for Yoga, Sports, Outdoors, Daily Use - 34 Oz Ayurvedic Copper Bottle by Jared Coleman

Nice copper glass. Definitely airtight, but make sure you screw the cap on all the way. I'm no expert, but I wouldn't recommend using this bottle during the day. Top up at night before bed and drink first thing in the morning for maximum health benefits. Or take it with you, but don't refill the same bottle throughout the day: copper is very good for your health, but health experts say too much can be toxic.