This is a replacement item. It is the a removable padded tray that can fit up to 12 spray paint cans. It is designed to fit in the Bombing Science BURNER Backpack. 

For the complete Burner Backpack:
https://shop.bombingscience.com/canada/bombing-science-burner-backpack.html

For the complete Burner Backpack WITH 12 cans of your choice:

https://shop.bombingscience.com/canada/burner-backpack-12-spray-paint-cans-bundle.html