SketchUp which is FREE for personal/non-commercial use. It is also the easiest/fastest 3D rendering software, that picture took about 5 minutes including looking up the specs of the bags. If I spent longer I could make it all colored/textured and pretty looking.
When my work slows down a bit I might take the time to render each one of the bags to scale and put them into the 3D objects library SketchUp has. I use it quite a bit for concert design because it has every light, speaker, truss and scenic element already drawn up.
I will try to add a few more when I get home, maybe even attempt a synapse!