Although i have no experience with it, there are several luggage courier companies, that will transfer stuff from your home to your destination. So you could have someone at home send the additional suitcase by one of these delivery companies when you arrive in France. As i say i don’t know much about the cost’s or quality of the service. May be worth looking in to it if you are desperate for the extra belongings to be with you in France

You can generally leave a bag at “left luggage” or in a locker at a major train station or airport for up to a month. However, it’s expensive (3 to 5 euros per bag per day is the norm) and they probably won’t knowingly take your laptop. We carried a briefcase that looked like a computer bag and were usually questioned about it’s contents and told they wouldn’t store a computer. Read all the stuff at the locker or luggage room carefully as items stored for more than a week may be moved to a different site. We left a bag in a locker at the Helsinki airport last summer. No problem for us, as it was there for 6 days, but the information said luggage left more than 7 days would be moved to a storage room and “where” wasn’t too clear. If you’re leaving something for 3 weeks, I’d plan on retrieving it a full day before it’s needed or before a flight.

The European rail companies provide baggage service and for a fee will transfer a bag — including door to door service to your hotel/hostel or wherever you’re staying. It takes some looking, but you should be able to find out about it on the individual national rail company websites.

I dont feel too comfortable leaving it in a locker.. because you never know how safe those are, but i think i will definitely look into having it delivered straight to the end of my trp. that seems like the easiest option.. and safest.. lol

Thank you!!