Organizing the Freezer

Its hard to find things in my freezer when it is packed solid. I have tried different things, starting with buying what will be used within the week, and placing items according to frequent use: Ice cream on top shelf (to keep from little ones), leftovers (which I immediately freeze after meals) on the second. The third, fourth and fifth shelves in my freezer are drawers, facilitating getting to items; I place frozen fish and sausages on upper drawer, meat on second and frozen vegetables on the bottom.
I have tried containers but they take too much room, although I use them for small items.  Any good suggestions?