Compactness

\begin{fbundle}{xxx}
\fchunk{aaa}
\chunk{\makebox[30pt]{
        \begin{fbundle}{yyy}
        \fchunk{bbb}
        \fchunk{ddd}
        \fchunk{eee}
        \end{fbundle}}}
\fchunk{ccc}
\end{fbundle}

\begin{bundle}{\framebox (30,15){xxx}}
\chunk{\framebox (30,15){aaa}}
\chunk{\ma...
...ramebox (30,15){eee}}
\end{bundle}}}
\chunk{\framebox (30,15){ccc}}\end{bundle}