Our Newest Boxx offers you great practical use. Inspired from our Original Boxx. We have now developed a slide function in a style you will not find anywhere else. The outer shell has been designed to coincide with the inner shell to compliment its slide function. We have opted to allow the inner shell to slide on two tracks either side. You will also find 4 clear rubber stops at the bottom of each box to minimalize any friction and offer sturdiness when you create your stacks.