Well, there is one of my boxes for my veggies next year. This one will be for my verticles and my long carrots. The boxes are built on a double thick layer of cardboard (I had a lot of flat boxes that we could not use -- too large for anything). They will be filled with my planting mix and seedlings, or seeds, planted directly there.
That orange stuff also has cardboard under it. It is a plastic, fake "mulch" weed barrier. I'm hoping to keep the weeds out with this. In any case it is really nice to walk or kneel on -- sort of cushy. I may put real bark on top of it and it won't wash off.