This mylar pp5 bottle is a non-toxic material, which prevents odors and nasty tastes to keep your drink fresh. To keep water cold this bottle features double-wall insulation, A small pressure valve within the nozzle ensures that lighter squeezes won’t release any liquid but it’ll deliver a good burst and decent flow when you give it a proper squeeze. This means that you don’t need to bite the valve (or pull it with your teeth) to get water flowing through it. The top has a twist-locking feature, preventing spillage. You can close the lock to seal it off for easy transport inside a bag. A wider opening at the neck would make adding energy powders a bit easier, especially when out riding. It’s also easy to fill with ice cubes and easy to clean. Recommended cleaning method is to rinse your bottle with warm water and a mild detergent.