I personally keep two stacks of all materials on me at all times and the surplus I would just throw at crucible vendor mainly for rep, marks was a plus. But like him I don't know why they changed it, NOW materials are just like Class materials and weapon parts, the problem is unlike the latter two they stop stacking at 200 so now I have seven hundred spinmetal four stacks that I just can't throw away lest they change the system yet again. The least they could have done is let them stack like the 3509 Weapon parts I have all neat in one stack. Cmon now.