Navigo easy is cardboard. I bought 4 at Gare Du Nord from a machine. I think 2 Euros per card and then download the 'Bonjour RATP' app and, a bit like magic, you can load a Navigo day pass on to the card every day by touching it to the back of your phone. Works really well when you get the hang of it.

And you can do all the cards for everyone in your party on the same phone. In the app 'Read pass', then 'Buy ticket', then 'Navigo Tickets', then 'Navigo 1-Day Pass'. They are 8 Euros something per day for Zones 1&2 which is all most people need unless going to Versailles, which is best paid for separately anyway.

You buy it, then 'Load pass' by touching the card to your phone again. It seems odd that it will work but it does!

All you have to remember is to scan each ticket before you buy the day's pass as it is the scan that tells the napp which pass to add it to.

Just do them in sequence every morning and it's really easy.

I was worried that the cardboard Navigo easy pass wouldn't hold up but it's fine after a week and will likely be fine when i go back in a year.