Welcome dibbler
The program which I used in the past was Burn to the Brim. You can find it on this
Link Good luck.
Burn To The Brim is a utility which selects the group of files or directories (documents, mp3 files, whatever you like to burn) which optimally fills a cdr or other medium (or multiple CDRs/media).
The program analyses the files and folders in a folder you specify, and groups them in the best possible way. Most likely BTTB will find a near-perfect solution for you within one second, and a perfect one in just a couple more.
The first priority is to fill the media to the brim, second is to minimize the number of items (so the larger, harder to fit items have preference and more items to choose from are left for the next burn).
BTTB is optimized for quick performance and considers the most promising options first. It also intelligently minimizes the search length by fast detection of dead ends.
It does NOT:
install software which silently logs and transmits all your moves on the net (SPYWARE)
show you annoying (or, if these would exist, non-annoying) ads (ADWARE)
contain megabytes of unnecessary data or code (BLOATWARE)
infest your registry with a zillion unnecessary entries slowing down windows as a whole
change the functioning of windows itself in any way
prevent you from doing a clean deinstallation
And its Free