How do I reduce the size of a Mac application bundle?

Question

I have a 120MB bundle that when is compressed (zip) is only 30MB. I, however, so not want to distribute a zip file. I want to distribute a bundle in a dmg.

Are there any tools I can use that will enable me to compress my bundle, but also preserve the bundle file structure so that no 'unzip' tool is needed by end-users?

Answer 1

Just discovered "hdiutil -format UDBZ" which creates a bzip2 compressed image.