Not too big, not too small, this bottle is just right. The narrowmouth makes for an easy-breezy drinking experience. The closure andbottle create a Leakproof system with no o-rings that can fall out.Bottle is dishwasher safe, just make sure the cap does not hit theheating element because if it does it will melt. All Everydaybottles are made with Eastman Tritan and are super durable andresistant to tastes and odors.