parskip package, keep the indents

Package parskip sets \parindent to zero. The following example saves the old value, loads parskip and restores \parindent:

\documentclass{article}

\edef\restoreparindent{\parindent=\the\parindent\relax}
\usepackage{parskip}
\restoreparindent

\begin{document}
\tableofcontents

\section{Section 1}
\subsection{Sub 1}

Paragraph 1

Paragraph 2
\end{document}