The exemption from CITES for personal effects for the US has already been posted multiple times in this thread. Here is the exemption for Canada:
CITES - Exemptions
www.canada.ca
And here’s the one for Japan:
However note that while you are exempt from CITES for personal effects for Japan (as long as your other country also has the exemption, which as mentioned is true for the US and Canada), you will still need to declare at customs (customs and the government agency for CITES are two different things), which presents other issues (eg cost of item, proving it is your personal used item - which can be separate challenges).
In my personal experience, unless for some reason an SA actually dealt with traveling with CITES species themselves, they won’t (and shouldn’t be expected to tbh) know how exactly the CITES exemptions for personal effects works for all the countries! Always research the countries you are traveling to (both of them), find their specific agency that implements CITES and check if they offer the exemption. When in doubt, contact that agency. And if you are like me, when possible, look up the actual legal documents that implement CITES for those countries just to triple check
In conclusion, for your case, none of the three countries would require you to actually have a CITES permit, but be aware that you will need to do customs declarations accordingly if required. The CITES Hermes has is for them to do
their commercial transaction (getting the bag from France to Canada in order to sell it, to you), that’s why the CITES is actually just for them. If you ever need to go to a country without CITES exemption for personal effects (big one I know: China), you will need to apply for a new CITES permit for yourself (the one for Hermes is again, theirs, and won’t cover your future use case in that situation).
Finally, I do suggest carrying the CITES copy that H gave you even though you are traveling under the exemption (and make a copy of it too so you have a back up in case an overzealous customs officer ever takes it from you even though they shouldn’t), because it helps to show important info such as which species the bag is, and that it is only an Appendix II species of CITES, which are much more relaxed generally than Appendix I species - some countries do not grant personal effect exemptions for I species, only II.