Permanent Resident Card and Citizenship in Canada

So my Permanent Resident card (PR) is about to expire in Canada. I apply for my Citizenship here and I'm waiting the answer. Time pass and now my PR card is expire and I question myself if can I travel while I'm waiting for my Citizenship answer since I apply for it. Doing a bit of research I found that basically...

• The Permanent Resident Card is just a proof of my status.
• The Permanent Residen Card in Canada acts like a travel document. 
• If my Permanent Residen Card expires, I don't loose my status.
• My card don't need to be valid, but acts as travel document, as a passport will be necessary to enter the country.
• It cost around 50$ CAD
• Citizenship and the Permanent Residen Card are two different process. 

So in resumen, you should renew your Permanent Resident Card while you are inside Canada. Is way much easier.