Upvote:2
There should be a generic answer for this as we have multiple times the same question for different airlines: Swiss, JetStar and SAS.
The meaning is the same: One single piece of checked baggage is included in the ticket.
What differs between airlines are the size and weight restrictions. For Air France:
Checked luggage is limited to linear 158 cm / 62.2" inches. This means that the width, height and depth of you luggage must add up to at most 158cm or 62.2".
The maximum weight is 23 kg / 50.7 lb in Economy or Premium Economy, or 32 kg / 70.5 lb in Business and First class.
The full text of these policies are found here.
In addition to checked baggage, you are also allowed one carry-on and one personal item. Most laptop bags fit under the personal item category which are restricted to 40 x 30 x 15 cm / 16 x 12 x 6 in and specifically state bag for a notebook computer, camera or any other electronic device. The allowed carry-on can be up to 55 x 35 x 25 cm / 21.7 x 13.8 x 9.9 in and has a generous 12kg weight limit.