What can plastic case and plastic box be used for?

Some of our customers are very interested in our plastic box and case, just like one of our customer's feeling after her meeting with us in our factory, that the box and case can be used in wide industries:
Here below are the list of their function:

1,  Small waterproof box for small accessories-protecting your car key, your bank card, your earphone, your watch etc when you are in outdoors or doing water sports.
      

2, Small waterproof plastic box for smartphone, harddisk, SD card , GPS etc when you are working underground in mine, oil field or any tough enviorment.
      
3,  Waterproof box for protecting tools,  first aid kits ,  testers,  small camera etc from water, dust etc. 
      
To be continued....