The sipping version is great for when you don’t have the desire or ability to play with the top lid. You can open it with one hand, and drink without splashing water all over yourself therefore it can adapt to almost any situation, whether you’re sitting at a desk, in the car, travelling, or at the gym. The lock feature works well, it doesn’t accidentally pop open and spill contents when this insulated water bottle is in your pack. It is spillproof and leakproof with normal use and vigorous shaking or twisting. Nice, polished and slim, making it a pleasing fit in the hand. It is comfortable to hold, not too big / not too small. It keeps drinks hot and cold for 2 hours. Come with an attached loop for easy transportation. Before the first use and after multiple refills, it is recommended that you wash your water bottle by hand with hot water and dish soap. It will help your product last longer.