Couple of things you might want to look in to: firstly, check the fare class you are travelling on. Assuming you're travelling in economy, if you're on a full fare ticket ('Y' class) then you can take two bags per person, each weighing up to 23kg. NB this only applies to bookings made since 1st February this year.

If not, then it might be worth checking how much it would cost to amend your booking so it is in this class, or, how much it would be to upgrade to Premium Economy where the allowance is two bags per person. Then you can weigh up whether you want the extra allowance and also the nicer travel experience. You'd only need to upgrade one-way to get the full two bag allowance for both flights.

Hope this helps.