blue bag noun2 •A lawyer's bag made of blue fabric to carry briefs, now as typically carried by a junior barrister.A battery of blue bags is loaded with heavy charges of papers and carried off by clerks. — 1852 •A bag containing alkaline blue laundry powder, used for whitening clothes.‘Nolly, Nolly,’ observed the Doctor, ‘I wish your maid would stop your foolish mouth with a blue-bag.’ — 1828 formsblue bags
