Storage bag with openly biased mouth

A storage bag (20) capable resealed, comprising: - a cavity bag, which has a passage (36) to an interior storage area (38) of the cavity bag; - A closing device (34), located proximate the passage (36), so that the closure device (34) movable between an engaged position closing the passage (36), and disengaged position, which opens the passage (36); means (60, 62, 64) to push or load the passage (36) to an open configuration when the locking device is disengaged; wherein the means (60, 62, 64) for loading include a pair of rails (60), each of which has a plurality of hinged segments (62).