Latte Lover,
Check to see if the weight limit you have is per PERSON or per BAG. My son is traveling to Brazil this summer with a group from school. I was a little surprised when the information came home that they were limited to ONE bag with a max weight of 70 lbs. as we had that weight limit per BAG with a two bag per person limit when we traveled not too long ago. In his case, they are limiting each traveler to 1 bag to accomodate all of the group equipment that has to go with them (they will be performing while in Brazil).
If you are allowed 2 bags with the 40 KG per person weight you might want to consider packing a duffel inside a more sturdy case on the way down. On the way back pack the duffel full of the clothes heading for the laundry room and the scrapbooking things can go into the case with more protection.
Deb