It is a good idea to pack your salt in this food grade cardboard tube packaging box dedicated for salt. Nothing complicated, as it is a package for food, all materials used should be safe for health and reliable to keep the food well sealed to avoid moisture and oxygenation. This tube packaging box for salt is made of 400g grey cardboard forming into a thick tube, as main body and robust protection, with silver foil paper attached in the inner face to seal the space against air and moisture. It has also a clear window made by PVC plastic to allow people to see how much salt is left – way that to remind them to resupply when running out. However, we don’t recommend putting salt directly into this tube, better seal them in another plastic inner bag as to have a double security. If you are interested, welcome to contact us and discuss further details of customization for you.