Empty Containers for Layers with No Content
If you want a layer to have no image in it just label the layer '_empty' in your PSD file. There are several reasons to create a box as an empty container:
1. To create a bounding region for '_relative' layers. Make your '_empty' layer larger and behind your '_relative' layers and the '_relative' layers will render inside the larger '_empty' layer
2. To create an area for a '_form'
3. To create a regions for '_page's