[Saiket]

Originally Posted by sacrife Both c1 and c2 returns 'nil'.

Oops, I think that would happen if it tried to sort empty bag slots. This version should just put them at the end instead of comparing the quality/IDs of empty slots.

local QuickSort;
do
    local func = function(v1, v2)
        if v1[1] == 0 or v2[1] == 0 then -- Empty bag slot
            return v1[1] > v2[1]; -- Put empty slots last
        elseif v1[2] ~= v2[2] then
            return v1[2] > v2[2]; -- Higher quality first
        elseif v1[1] ~= v2[1] then
            return v1[1] < v2[1];
        else -- Compare stack counts
            local _, c1 = GetContainerItemInfo(v1[3].bagID, v1[3].slotID);
            local _, c2 = GetContainerItemInfo(v2[3].bagID, v2[3].slotID);
            return c1 < c2;
        end
    end;
    QuickSort = function(tbl) table.sort(tbl, func); end
end