Size If you want to sterilize the bottle with hot water, preheat the bottle first with warm tap water. This prevents the glass from cracking. Dishwasher-safe. Wash and dry this product before using it for the first time.Key features Tight-fitting stopper that prevents leakage.Good to know If you want to sterilize the bottle with hot water, preheat the bottle first with warm tap water. This prevents the glass from cracking. Dishwasher-safe. Wash and dry this product before using it for the first time.