I use some kitchen storage containers from Wal mart. A clear jar with molded handle and large opening screw top. Suitable for getting a fist in there. Although the larger ones store better the smaller (same cross section and top) ones are easier to dispense nearing empty. A 2 oz protein powder scoop, coffee scoop and/or small plastic spoons (won't sink) work well depending on the batch size. They are cheap and not on line, just in the store. $3 range.
Experience says respirator filter. Flox, micro, cabosil, chopped glass, all got containers.