I've found that storing items on B-team has become a bit of a problem. I understand that the Modular Systems mod author has abandoned the project and its been removed from Galactic Science mod pack but since B-Team isn't a mod pack that is still under construction then I don't see why we couldn't use it. I know the Project Red is the best item storage in B-team but i find it to be slow, bulky, inefficient, and resource intensive (both item and CPU load).
I don't think Modular systems is in B-Team and because B-team is a Techinic modpack we are not adding mods to it. Else people using the Technic client will not be able to join.