LOVE these!  I came upon them by accident while looking up something else on Amazon, and am I ever happy I did!  I use them two ways.  If I don't really know what the weather will be where I am going, I will pack a variety of tops in one, bottoms in another, and 'underthings' in the third.  If I am pretty confident about what I will be wearing, I just put outfits together and pack one in each cube.  This has been really helpful when I am staying at different places.  I will leave my main suitcase at one location, and then just grab a cube with a pre-packed outfit to wherever I am staying that night (for instance staying with different home town friends).  The next day I take out the new clothes and stick the clothes I was wearing the previous dat back in the cube.  They really help my suitcase to stay neat and organized.