Here are two examples of lockers using tubes to organize the wine.   

 

Some like to use the shipping case to hold the bottles or pvc pipe, but these options tend to waste space.  The paper tubes can be made to fit the actual size of the bottles and create a honeycomb that supports the bottles.  Most of these lockers are deep enough that you can put two bottles per tube.  For more info on storage tubes, send us an email of what you are looking for.  Cheers!!