There are several considerations when looking at which bait and how much to take;
Firstly it is important to check with the venue exactly what is allowed - most commercial venues in France have strict rules about the type of baits allowed, this often includes a ban on shelf-life boilies, particle baits and nuts for example.
You would not want to waste valuable space in your vehicle taking sacks of hemp to France only to find on arrival that you can not use it!
This leads on to the issue of the available space in the vehicle which can be relevant for example when 2 anglers are sharing a car and space is at a premium.Large quantities of bait take up a substantial amount of room in a car, so it worthwhile checking to see if the venue sells bait on site.
Many of the commercial lakes will sell bait and in fact some will insist that you use the bait that they sell.
At first glance this might seem like blatant profiteering but in fact in the majority of cases this rule is made because the fishery owners want ot be sure of what the carp are eating. With carp anglers of all levels of experience now visiting France it has become necessary to make strict rules at these fisheries.
Possibly the most important consideration will be the type of bait that is most often used at the venue - i.e. the bait that the carp see regularly and thus will therefore consider semi-natural.
If the venue sell boilies on site, then this will most probably be the bait that the carp are used to finding, and if pellets are sold, then the fish will probably be fed on these pellets during the closed season (normally November - March).
In my opinion, which is based on results at my walk in freezer for sale own lake Les Croix and other venues which I am familiar with, it is better to use the bait sold on site because I have found that when anglers use another bait (particularly if it has never been introduced to the water before).
It often takes 3 or 4 days before the carp start to eat the new bait, presumably this is because they do not recognise it or are wary of it, but regardless of the explanation, it could have a very negative impact on your results for the week if you spend 3 or 4 days waiting for the fish to get onto your bait.
Whereas some baits seem to work almost everywhere, there are others that work very well on some lakes and not on others.
You could potentially end up taking a bait that does not work on the lake! So please do your homework and look into this aspect.
Once you have found out what is allowed, what is used and what works, you can then begin to think about how much to take with you.
If you can only use the bait sold on site then there will be one less thing to think about - this is in fact a huge bonus as you can buy bait as and when you need it - thus eliminating the dilemma of how much bait you might need and the possibility of buying too much bait and bringing it home with you or ending up having thrown bait away.