Durable Glass Hydration Bottle is perfect for indoor or outdoor use. Great for packing along for hiking, camping, traveling, or just for around the house. This is a set of 2 glass bottles with a screw on cap. The 16 Oz size is perfect for a water bottle and fits common water bottle holders. These bottles have a Screw On Cap which ensures the cap won't pop off if the bottle is tipped over. Be sure to remove the tamper-evidence ring from the cap before screwing the cap tight.