Using this G.I. Bladder Canteen is easy. Just remove the attached cap and fill it with water or your favorite drink up to the 2 - quart capacity. When you're done using it, collapse it to save space in your bag or pack. Remember to keep it clean. You can wash it with mild soap and water regularly. Don't expose it to extremely high temperatures as it might damage the BPA - free material. Also, make sure the cap is tightly closed to prevent leaks. This canteen is made in the USA, so you can trust its quality for your field adventures.