The invention relates to a pump for inflating an inflatable object of large volume, the pump consisting of a waterproof bag (10) made of flexible material in which the inflatable object is capable of being stored, said bag comprising a plurality of valve and / or flap type elements (12, 13) arranged to allow inspiration of air inside the bag through an air inlet, without the need to open the bag, then an expiration of the air contained in the bag by an air outlet separate from the air inlet, said bag also comprising, on a circumferential wall of the bag, a shaping device making it possible to maintain the shape of a bag of maximum volume. According to the invention, the pump is characterized in that the shaping device comprises a plurality of arches (21 to 25) fixed to the wall of the bag so that the arches extend in planes substantially perpendicular to an axis of the bag. cylinder formed by the bag when the bag is filled. Application to the transport of a plurality of articles and to the inflation of large-volume objects such as an inflatable boat. Abstract figure: Figure 1
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