The one thing that annoys me about inventory and bags is when there are no free slots, but you have a quest reward or harvest material or something of that ilk to be added to a current stack in the bags. It won't let you complete the quest or harvest the item unless there is a free slot. You run around to sell/ vault or throw away something to get a free slot only to have the item added to the stack leaving you with a free slot when you didn't need to free it up in the first place. Please can you have items add to a stack within a bag without having to free up unnecessary space.