Forums for the Grievance Family

All those weapons you got or find for other classes.
If you can, switch to that class and equip them.
Frees up some bag space

you don't even have to switch you can just right click EQUIP and it will go directly into that toons slots.

and from the equipment page you can just click on the class name from the left side of your screen and view what you have equipped on that class (and equip new gear) without changing to that class.