A bag is disclosed for storing, reconstituting and/or diluting injectable products, and a safety device for use in a bottle for a medicament to be reconstituted and/or diluted in a bag for storing, reconstituting and/or diluting injectable products. The present invention patent relates to a bag (1) for storing a liquid substance (SL) used for reconstituting and/or diluting a medicament (M) the bag (1) has two accesses, so-called inlet (3) and outlet (4), both containing closing devices for releasing or stopping the flow of a liquid that flows into or out of the bag (1). The inlet (3) comprises a filtering element for retaining particles possibly produced by the coring phenomenon which can occur when the spike (20) of the inlet ruptures the plug (40) of the bottle (37) . The present patent also comprises a safety device (2) used for permanently attaching the bottle (37) to the inlet (3). The bag (1) allows the substance contained therein to be used either entirely in a single volume or in a fractionated manner.
