At Nalgene they have very high standards when it comes to calling a container leakproof. They fill up the container and then pressurize it. If it does not leak they consider it to pass the test and be worthy of being called leakproof. They test the jars by filling them with water and then turning them upside down. If no water comes out they consider the jar to pass the test. So jars will hold liquid but they are not held to as high a standard as the bottles. The jars may be a better choice for thicker liquids such as lotions or gels. And of course they are great for Tums, Beano, or Advil.
At Nalgene, they're all about helping people simplify their lives while respecting the environment. That is why they created reusable containers of all kinds, made from a wide range of materials to suit your personal preferences, needs and lifestyle. So whether you are looking for a virtually indestructible drinking bottle for a backcountry adventure, or you want a clean, green way of storing your dry pasta, you can find a Nalgene product that gets the job done.
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