It is usual on Le Puy route to book accommodation ahead., whether this is a Gite or Chambre d’hôte,
Thus you will know ‘where’ you are transporting your sac. Over the course from Le Puy to SJPDP., I saw a lot of bag transportation in 2016. In France it is also possible (on occasion) to pay to get a lift with the bags. My opinion changed about bag transport about 9 days before SJPDP by which time I had developed corns between toes and needed to carry much less weight. It was amazing the relief ! And I realise that sometimes it is necessary., although I haven’t had to use it since then.
There were two ladies I had been walking with that explained the ‘system’ to me and they booked it. They actually only sent one bag and the 2nd lady only added her sleep sac and a couple of heavier items to it.
Usually at the Gite there are supplies of cards/envelopes; that you attach to your backpack (with name of destination ) and then Gite owner tells you where to leave it. When you arrive at destination., you may have to ask where they would have been dropped off. Sometimes there are quite a number of them !!
You would have to ask the individual carrier, when you book how payment needs to be arranged. (You can set up multiple days as long as you’ve booked and know where to send.
With my final 7 days - they just requested the money to be in the envelope attached to the bag !! Yep —- a lot of trust there. Payment (on that occasion) had to be made on the 2nd last day so that ‘they ‘were sure of being paid.
I was told by pilgrims using the system earlier on the way that different carriers operated until a certain point and then another one would need to be contacted for the following zone. I know that friends somewhere in the middle used ‘La Malle Postale. ‘.
Your Gite owner will have info ., phone numbers etc.
you’ll find what you need I’m pretty certain
Bon chemin
Annie