Greedy algorithm to divide objects into the lowest number of groups of a maximum size

I have n objects of independent size s, and need to group them so that the sum of the sizes of each group is smaller than a given maximum size, and the number of groups is the smallest possible.

I already tried a brute force algorithm that orders the objects in all possible permutations and then, based on their size and the group max size, divides every permutation in groups based on the order. This algorithm is very slow and therefore I want to find a greedy one, but being new to the topic I can’t think of a good way to start.

My idea would be to start building the first group from the largest object, and then adding more so that every time I add a new one, the difference between the max size and the size of all the objects in the group is minimized. Is this a good starting point?